diff --git a/.strict-typing b/.strict-typing
index 8938e694a7e..9df3d16dc43 100644
--- a/.strict-typing
+++ b/.strict-typing
@@ -213,6 +213,7 @@ homeassistant.components.recorder.*
 homeassistant.components.remote.*
 homeassistant.components.renault.*
 homeassistant.components.repairs.*
+homeassistant.components.rfxtrx.*
 homeassistant.components.rhasspy.*
 homeassistant.components.ridwell.*
 homeassistant.components.rituals_perfume_genie.*
diff --git a/homeassistant/components/rfxtrx/__init__.py b/homeassistant/components/rfxtrx/__init__.py
index 3257a482c0c..31a0e4694ba 100644
--- a/homeassistant/components/rfxtrx/__init__.py
+++ b/homeassistant/components/rfxtrx/__init__.py
@@ -6,7 +6,7 @@ import binascii
 from collections.abc import Callable
 import copy
 import logging
-from typing import NamedTuple, cast
+from typing import Any, NamedTuple, cast
 
 import RFXtrx as rfxtrxmod
 import async_timeout
@@ -61,7 +61,7 @@ class DeviceTuple(NamedTuple):
     id_string: str
 
 
-def _bytearray_string(data):
+def _bytearray_string(data: Any) -> bytearray:
     val = cv.string(data)
     try:
         return bytearray.fromhex(val)
@@ -116,7 +116,7 @@ async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     return True
 
 
-def _create_rfx(config):
+def _create_rfx(config: dict[str, Any]) -> rfxtrxmod.Connect:
     """Construct a rfx object based on config."""
 
     modes = config.get(CONF_PROTOCOLS)
@@ -144,7 +144,9 @@ def _create_rfx(config):
     return rfx
 
 
-def _get_device_lookup(devices):
+def _get_device_lookup(
+    devices: dict[str, dict[str, Any]]
+) -> dict[DeviceTuple, dict[str, Any]]:
     """Get a lookup structure for devices."""
     lookup = {}
     for event_code, event_config in devices.items():
@@ -157,7 +159,7 @@ def _get_device_lookup(devices):
     return lookup
 
 
-async def async_setup_internal(hass, entry: ConfigEntry):
+async def async_setup_internal(hass: HomeAssistant, entry: ConfigEntry) -> None:
     """Set up the RFXtrx component."""
     config = entry.data
 
@@ -173,7 +175,7 @@ async def async_setup_internal(hass, entry: ConfigEntry):
 
     # Declare the Handle event
     @callback
-    def async_handle_receive(event):
+    def async_handle_receive(event: rfxtrxmod.RFXtrxEvent) -> None:
         """Handle received messages from RFXtrx gateway."""
         # Log RFXCOM event
         if not event.device.id_string:
@@ -204,7 +206,7 @@ async def async_setup_internal(hass, entry: ConfigEntry):
             pt2262_devices.append(event.device.id_string)
 
         device_entry = device_registry.async_get_device(
-            identifiers={(DOMAIN, *device_id)},
+            identifiers={(DOMAIN, *device_id)},  # type: ignore[arg-type]
         )
         if device_entry:
             event_data[ATTR_DEVICE_ID] = device_entry.id
@@ -216,7 +218,7 @@ async def async_setup_internal(hass, entry: ConfigEntry):
         hass.bus.async_fire(EVENT_RFXTRX_EVENT, event_data)
 
     @callback
-    def _add_device(event, device_id):
+    def _add_device(event: rfxtrxmod.RFXtrxEvent, device_id: DeviceTuple) -> None:
         """Add a device to config entry."""
         config = {}
         config[CONF_DEVICE_ID] = device_id
@@ -237,7 +239,7 @@ async def async_setup_internal(hass, entry: ConfigEntry):
         devices[device_id] = config
 
     @callback
-    def _remove_device(device_id: DeviceTuple):
+    def _remove_device(device_id: DeviceTuple) -> None:
         data = {
             **entry.data,
             CONF_DEVICES: {
@@ -250,7 +252,7 @@ async def async_setup_internal(hass, entry: ConfigEntry):
         devices.pop(device_id)
 
     @callback
-    def _updated_device(event: Event):
+    def _updated_device(event: Event) -> None:
         if event.data["action"] != "remove":
             return
         device_entry = device_registry.deleted_devices[event.data["device_id"]]
@@ -264,7 +266,7 @@ async def async_setup_internal(hass, entry: ConfigEntry):
         hass.bus.async_listen(dr.EVENT_DEVICE_REGISTRY_UPDATED, _updated_device)
     )
 
-    def _shutdown_rfxtrx(event):
+    def _shutdown_rfxtrx(event: Event) -> None:
         """Close connection with RFXtrx."""
         rfx_object.close_connection()
 
@@ -288,10 +290,15 @@ async def async_setup_platform_entry(
     async_add_entities: AddEntitiesCallback,
     supported: Callable[[rfxtrxmod.RFXtrxEvent], bool],
     constructor: Callable[
-        [rfxtrxmod.RFXtrxEvent, rfxtrxmod.RFXtrxEvent | None, DeviceTuple, dict],
+        [
+            rfxtrxmod.RFXtrxEvent,
+            rfxtrxmod.RFXtrxEvent | None,
+            DeviceTuple,
+            dict[str, Any],
+        ],
         list[Entity],
     ],
-):
+) -> None:
     """Set up config entry."""
     entry_data = config_entry.data
     device_ids: set[DeviceTuple] = set()
@@ -320,7 +327,7 @@ async def async_setup_platform_entry(
     if entry_data[CONF_AUTOMATIC_ADD]:
 
         @callback
-        def _update(event: rfxtrxmod.RFXtrxEvent, device_id: DeviceTuple):
+        def _update(event: rfxtrxmod.RFXtrxEvent, device_id: DeviceTuple) -> None:
             """Handle light updates from the RFXtrx gateway."""
             if not supported(event):
                 return
@@ -373,7 +380,7 @@ def get_pt2262_cmd(device_id: str, data_bits: int) -> str | None:
 
 
 def get_device_data_bits(
-    device: rfxtrxmod.RFXtrxDevice, devices: dict[DeviceTuple, dict]
+    device: rfxtrxmod.RFXtrxDevice, devices: dict[DeviceTuple, dict[str, Any]]
 ) -> int | None:
     """Deduce data bits for device based on a cache of device bits."""
     data_bits = None
@@ -488,9 +495,9 @@ class RfxtrxEntity(RestoreEntity):
         self._device_id = device_id
         # If id_string is 213c7f2:1, the group_id is 213c7f2, and the device will respond to
         # group events regardless of their group indices.
-        (self._group_id, _, _) = device.id_string.partition(":")
+        (self._group_id, _, _) = cast(str, device.id_string).partition(":")
 
-    async def async_added_to_hass(self):
+    async def async_added_to_hass(self) -> None:
         """Restore RFXtrx device state (ON/OFF)."""
         if self._event:
             self._apply_event(self._event)
@@ -500,13 +507,15 @@ class RfxtrxEntity(RestoreEntity):
         )
 
     @property
-    def extra_state_attributes(self):
+    def extra_state_attributes(self) -> dict[str, str] | None:
         """Return the device state attributes."""
         if not self._event:
             return None
         return {ATTR_EVENT: "".join(f"{x:02x}" for x in self._event.data)}
 
-    def _event_applies(self, event: rfxtrxmod.RFXtrxEvent, device_id: DeviceTuple):
+    def _event_applies(
+        self, event: rfxtrxmod.RFXtrxEvent, device_id: DeviceTuple
+    ) -> bool:
         """Check if event applies to me."""
         if isinstance(event, rfxtrxmod.ControlEvent):
             if (
@@ -514,7 +523,7 @@ class RfxtrxEntity(RestoreEntity):
                 and event.values["Command"] in COMMAND_GROUP_LIST
             ):
                 device: rfxtrxmod.RFXtrxDevice = event.device
-                (group_id, _, _) = device.id_string.partition(":")
+                (group_id, _, _) = cast(str, device.id_string).partition(":")
                 return group_id == self._group_id
 
         # Otherwise, the event only applies to the matching device.
@@ -546,6 +555,6 @@ class RfxtrxCommandEntity(RfxtrxEntity):
         """Initialzie a switch or light device."""
         super().__init__(device, device_id, event=event)
 
-    async def _async_send(self, fun, *args):
+    async def _async_send(self, fun: Callable[..., None], *args: Any) -> None:
         rfx_object = self.hass.data[DOMAIN][DATA_RFXOBJECT]
         await self.hass.async_add_executor_job(fun, rfx_object.transport, *args)
diff --git a/homeassistant/components/rfxtrx/binary_sensor.py b/homeassistant/components/rfxtrx/binary_sensor.py
index df79c17263c..03ad7ce071b 100644
--- a/homeassistant/components/rfxtrx/binary_sensor.py
+++ b/homeassistant/components/rfxtrx/binary_sensor.py
@@ -2,6 +2,7 @@
 from __future__ import annotations
 
 import logging
+from typing import Any
 
 import RFXtrx as rfxtrxmod
 
@@ -14,6 +15,7 @@ from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import CONF_COMMAND_OFF, CONF_COMMAND_ON, STATE_ON
 from homeassistant.core import CALLBACK_TYPE, HomeAssistant, callback
 from homeassistant.helpers import event as evt
+from homeassistant.helpers.entity import Entity
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 
 from . import DeviceTuple, RfxtrxEntity, async_setup_platform_entry, get_pt2262_cmd
@@ -72,7 +74,7 @@ SENSOR_TYPES = (
 SENSOR_TYPES_DICT = {desc.key: desc for desc in SENSOR_TYPES}
 
 
-def supported(event: rfxtrxmod.RFXtrxEvent):
+def supported(event: rfxtrxmod.RFXtrxEvent) -> bool:
     """Return whether an event supports binary_sensor."""
     if isinstance(event, rfxtrxmod.ControlEvent):
         return True
@@ -91,7 +93,7 @@ async def async_setup_entry(
 ) -> None:
     """Set up config entry."""
 
-    def get_sensor_description(type_string: str):
+    def get_sensor_description(type_string: str) -> BinarySensorEntityDescription:
         if (description := SENSOR_TYPES_DICT.get(type_string)) is None:
             return BinarySensorEntityDescription(key=type_string)
         return description
@@ -100,8 +102,8 @@ async def async_setup_entry(
         event: rfxtrxmod.RFXtrxEvent,
         auto: rfxtrxmod.RFXtrxEvent | None,
         device_id: DeviceTuple,
-        entity_info: dict,
-    ):
+        entity_info: dict[str, Any],
+    ) -> list[Entity]:
 
         return [
             RfxtrxBinarySensor(
@@ -122,10 +124,13 @@ async def async_setup_entry(
 
 
 class RfxtrxBinarySensor(RfxtrxEntity, BinarySensorEntity):
-    """A representation of a RFXtrx binary sensor."""
+    """A representation of a RFXtrx binary sensor.
+
+    Since all repeated events have meaning, these types of sensors
+    need to have force update enabled.
+    """
 
     _attr_force_update = True
-    """We should force updates. Repeated states have meaning."""
 
     def __init__(
         self,
@@ -159,7 +164,7 @@ class RfxtrxBinarySensor(RfxtrxEntity, BinarySensorEntity):
         if self.is_on and self._off_delay is not None:
             self._attr_is_on = False
 
-    def _apply_event_lighting4(self, event: rfxtrxmod.RFXtrxEvent):
+    def _apply_event_lighting4(self, event: rfxtrxmod.RFXtrxEvent) -> None:
         """Apply event for a lighting 4 device."""
         if self._data_bits is not None:
             cmdstr = get_pt2262_cmd(event.device.id_string, self._data_bits)
@@ -172,7 +177,7 @@ class RfxtrxBinarySensor(RfxtrxEntity, BinarySensorEntity):
         else:
             self._attr_is_on = True
 
-    def _apply_event_standard(self, event: rfxtrxmod.RFXtrxEvent):
+    def _apply_event_standard(self, event: rfxtrxmod.RFXtrxEvent) -> None:
         assert isinstance(event, (rfxtrxmod.SensorEvent, rfxtrxmod.ControlEvent))
         if event.values.get("Command") in COMMAND_ON_LIST:
             self._attr_is_on = True
@@ -183,7 +188,7 @@ class RfxtrxBinarySensor(RfxtrxEntity, BinarySensorEntity):
         elif event.values.get("Sensor Status") in SENSOR_STATUS_OFF:
             self._attr_is_on = False
 
-    def _apply_event(self, event: rfxtrxmod.RFXtrxEvent):
+    def _apply_event(self, event: rfxtrxmod.RFXtrxEvent) -> None:
         """Apply command from rfxtrx."""
         super()._apply_event(event)
         if event.device.packettype == DEVICE_PACKET_TYPE_LIGHTING4:
@@ -192,7 +197,9 @@ class RfxtrxBinarySensor(RfxtrxEntity, BinarySensorEntity):
             self._apply_event_standard(event)
 
     @callback
-    def _handle_event(self, event: rfxtrxmod.RFXtrxEvent, device_id: DeviceTuple):
+    def _handle_event(
+        self, event: rfxtrxmod.RFXtrxEvent, device_id: DeviceTuple
+    ) -> None:
         """Check if event applies to me and update."""
         if not self._event_applies(event, device_id):
             return
@@ -215,7 +222,7 @@ class RfxtrxBinarySensor(RfxtrxEntity, BinarySensorEntity):
         if self.is_on and self._off_delay is not None:
 
             @callback
-            def off_delay_listener(now):
+            def off_delay_listener(now: Any) -> None:
                 """Switch device off after a delay."""
                 self._delay_listener = None
                 self._attr_is_on = False
diff --git a/homeassistant/components/rfxtrx/config_flow.py b/homeassistant/components/rfxtrx/config_flow.py
index 508ca9a7037..7b5fdc08261 100644
--- a/homeassistant/components/rfxtrx/config_flow.py
+++ b/homeassistant/components/rfxtrx/config_flow.py
@@ -4,14 +4,14 @@ from __future__ import annotations
 import copy
 import itertools
 import os
-from typing import TypedDict, cast
+from typing import Any, TypedDict, cast
 
 import RFXtrx as rfxtrxmod
 import serial
 import serial.tools.list_ports
 import voluptuous as vol
 
-from homeassistant import config_entries, exceptions
+from homeassistant import config_entries, data_entry_flow, exceptions
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import (
     CONF_COMMAND_OFF,
@@ -64,7 +64,7 @@ class DeviceData(TypedDict):
     device_id: DeviceTuple
 
 
-def none_or_int(value, base):
+def none_or_int(value: str | None, base: int) -> int | None:
     """Check if strin is one otherwise convert to int."""
     if value is None:
         return None
@@ -80,17 +80,21 @@ class OptionsFlow(config_entries.OptionsFlow):
     def __init__(self, config_entry: ConfigEntry) -> None:
         """Initialize rfxtrx options flow."""
         self._config_entry = config_entry
-        self._global_options = None
-        self._selected_device = None
+        self._global_options: dict[str, Any] = {}
+        self._selected_device: dict[str, Any] = {}
         self._selected_device_entry_id: str | None = None
         self._selected_device_event_code: str | None = None
         self._selected_device_object: rfxtrxmod.RFXtrxEvent | None = None
 
-    async def async_step_init(self, user_input=None):
+    async def async_step_init(
+        self, user_input: dict[str, Any] | None = None
+    ) -> data_entry_flow.FlowResult:
         """Manage the options."""
         return await self.async_step_prompt_options()
 
-    async def async_step_prompt_options(self, user_input=None):
+    async def async_step_prompt_options(
+        self, user_input: dict[str, Any] | None = None
+    ) -> data_entry_flow.FlowResult:
         """Prompt for options."""
         errors = {}
 
@@ -103,7 +107,8 @@ class OptionsFlow(config_entries.OptionsFlow):
                 entry_id = user_input[CONF_DEVICE]
                 device_data = self._get_device_data(entry_id)
                 self._selected_device_entry_id = entry_id
-                event_code = device_data[CONF_EVENT_CODE]
+                event_code = device_data["event_code"]
+                assert event_code
                 self._selected_device_event_code = event_code
                 self._selected_device = self._config_entry.data[CONF_DEVICES][
                     event_code
@@ -111,7 +116,9 @@ class OptionsFlow(config_entries.OptionsFlow):
                 self._selected_device_object = get_rfx_object(event_code)
                 return await self.async_step_set_device_options()
             if CONF_EVENT_CODE in user_input:
-                self._selected_device_event_code = user_input[CONF_EVENT_CODE]
+                self._selected_device_event_code = cast(
+                    str, user_input[CONF_EVENT_CODE]
+                )
                 self._selected_device = {}
                 selected_device_object = get_rfx_object(
                     self._selected_device_event_code
@@ -159,13 +166,17 @@ class OptionsFlow(config_entries.OptionsFlow):
             step_id="prompt_options", data_schema=vol.Schema(options), errors=errors
         )
 
-    async def async_step_set_device_options(self, user_input=None):
+    async def async_step_set_device_options(
+        self, user_input: dict[str, Any] | None = None
+    ) -> data_entry_flow.FlowResult:
         """Manage device options."""
         errors = {}
+        assert self._selected_device_object
+        assert self._selected_device_event_code
 
         if user_input is not None:
-            assert self._selected_device_object
-            assert self._selected_device_event_code
+            devices: dict[str, dict[str, Any] | None] = {}
+            device: dict[str, Any]
             device_id = get_device_id(
                 self._selected_device_object.device,
                 data_bits=user_input.get(CONF_DATA_BITS),
@@ -278,16 +289,16 @@ class OptionsFlow(config_entries.OptionsFlow):
                     ),
                 }
             )
-        devices = {
+        replace_devices = {
             entry.id: entry.name_by_user if entry.name_by_user else entry.name
             for entry in self._device_entries
             if self._can_replace_device(entry.id)
         }
 
-        if devices:
+        if replace_devices:
             data_schema.update(
                 {
-                    vol.Optional(CONF_REPLACE_DEVICE): vol.In(devices),
+                    vol.Optional(CONF_REPLACE_DEVICE): vol.In(replace_devices),
                 }
             )
 
@@ -297,11 +308,13 @@ class OptionsFlow(config_entries.OptionsFlow):
             errors=errors,
         )
 
-    async def _async_replace_device(self, replace_device):
+    async def _async_replace_device(self, replace_device: str) -> None:
         """Migrate properties of a device into another."""
         device_registry = self._device_registry
         old_device = self._selected_device_entry_id
+        assert old_device
         old_entry = device_registry.async_get(old_device)
+        assert old_entry
         device_registry.async_update_device(
             replace_device,
             area_id=old_entry.area_id,
@@ -343,23 +356,29 @@ class OptionsFlow(config_entries.OptionsFlow):
 
         device_registry.async_remove_device(old_device)
 
-    def _can_add_device(self, new_rfx_obj):
+    def _can_add_device(self, new_rfx_obj: rfxtrxmod.RFXtrxEvent) -> bool:
         """Check if device does not already exist."""
         new_device_id = get_device_id(new_rfx_obj.device)
         for packet_id, entity_info in self._config_entry.data[CONF_DEVICES].items():
             rfx_obj = get_rfx_object(packet_id)
+            assert rfx_obj
+
             device_id = get_device_id(rfx_obj.device, entity_info.get(CONF_DATA_BITS))
             if new_device_id == device_id:
                 return False
 
         return True
 
-    def _can_replace_device(self, entry_id):
+    def _can_replace_device(self, entry_id: str) -> bool:
         """Check if device can be replaced with selected device."""
+        assert self._selected_device_object
+
         device_data = self._get_device_data(entry_id)
 
-        if (event_code := device_data[CONF_EVENT_CODE]) is not None:
+        if (event_code := device_data["event_code"]) is not None:
             rfx_obj = get_rfx_object(event_code)
+            assert rfx_obj
+
             if (
                 rfx_obj.device.packettype
                 == self._selected_device_object.device.packettype
@@ -371,12 +390,12 @@ class OptionsFlow(config_entries.OptionsFlow):
 
         return False
 
-    def _get_device_event_code(self, entry_id):
+    def _get_device_event_code(self, entry_id: str) -> str | None:
         data = self._get_device_data(entry_id)
 
-        return data[CONF_EVENT_CODE]
+        return data["event_code"]
 
-    def _get_device_data(self, entry_id) -> DeviceData:
+    def _get_device_data(self, entry_id: str) -> DeviceData:
         """Get event code based on device identifier."""
         event_code: str | None = None
         entry = self._device_registry.async_get(entry_id)
@@ -390,7 +409,11 @@ class OptionsFlow(config_entries.OptionsFlow):
         return DeviceData(event_code=event_code, device_id=device_id)
 
     @callback
-    def update_config_data(self, global_options=None, devices=None):
+    def update_config_data(
+        self,
+        global_options: dict[str, Any] | None = None,
+        devices: dict[str, Any] | None = None,
+    ) -> None:
         """Update data in ConfigEntry."""
         entry_data = self._config_entry.data.copy()
         entry_data[CONF_DEVICES] = copy.deepcopy(self._config_entry.data[CONF_DEVICES])
@@ -413,12 +436,14 @@ class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
 
     VERSION = 1
 
-    async def async_step_user(self, user_input=None):
+    async def async_step_user(
+        self, user_input: dict[str, Any] | None = None
+    ) -> data_entry_flow.FlowResult:
         """Step when user initializes a integration."""
         await self.async_set_unique_id(DOMAIN)
         self._abort_if_unique_id_configured()
 
-        errors = {}
+        errors: dict[str, str] = {}
         if user_input is not None:
             if user_input[CONF_TYPE] == "Serial":
                 return await self.async_step_setup_serial()
@@ -430,9 +455,11 @@ class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
         schema = vol.Schema({vol.Required(CONF_TYPE): vol.In(list_of_types)})
         return self.async_show_form(step_id="user", data_schema=schema, errors=errors)
 
-    async def async_step_setup_network(self, user_input=None):
+    async def async_step_setup_network(
+        self, user_input: dict[str, Any] | None = None
+    ) -> data_entry_flow.FlowResult:
         """Step when setting up network configuration."""
-        errors = {}
+        errors: dict[str, str] = {}
 
         if user_input is not None:
             host = user_input[CONF_HOST]
@@ -455,9 +482,11 @@ class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
             errors=errors,
         )
 
-    async def async_step_setup_serial(self, user_input=None):
+    async def async_step_setup_serial(
+        self, user_input: dict[str, Any] | None = None
+    ) -> data_entry_flow.FlowResult:
         """Step when setting up serial configuration."""
-        errors = {}
+        errors: dict[str, str] = {}
 
         if user_input is not None:
             user_selection = user_input[CONF_DEVICE]
@@ -493,9 +522,11 @@ class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
             errors=errors,
         )
 
-    async def async_step_setup_serial_manual_path(self, user_input=None):
+    async def async_step_setup_serial_manual_path(
+        self, user_input: dict[str, Any] | None = None
+    ) -> data_entry_flow.FlowResult:
         """Select path manually."""
-        errors = {}
+        errors: dict[str, str] = {}
 
         if user_input is not None:
             device = user_input[CONF_DEVICE]
@@ -514,7 +545,12 @@ class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
             errors=errors,
         )
 
-    async def async_validate_rfx(self, host=None, port=None, device=None):
+    async def async_validate_rfx(
+        self,
+        host: str | None = None,
+        port: int | None = None,
+        device: str | None = None,
+    ) -> dict[str, Any]:
         """Create data for rfxtrx entry."""
         success = await self.hass.async_add_executor_job(
             _test_transport, host, port, device
@@ -522,7 +558,7 @@ class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
         if not success:
             raise CannotConnect
 
-        data = {
+        data: dict[str, Any] = {
             CONF_HOST: host,
             CONF_PORT: port,
             CONF_DEVICE: device,
@@ -538,7 +574,7 @@ class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
         return OptionsFlow(config_entry)
 
 
-def _test_transport(host, port, device):
+def _test_transport(host: str | None, port: int | None, device: str | None) -> bool:
     """Construct a rfx object based on config."""
     if port is not None:
         try:
diff --git a/homeassistant/components/rfxtrx/cover.py b/homeassistant/components/rfxtrx/cover.py
index 5e1788194f5..532e41ac50c 100644
--- a/homeassistant/components/rfxtrx/cover.py
+++ b/homeassistant/components/rfxtrx/cover.py
@@ -10,6 +10,7 @@ from homeassistant.components.cover import CoverEntity, CoverEntityFeature
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import STATE_OPEN
 from homeassistant.core import HomeAssistant, callback
+from homeassistant.helpers.entity import Entity
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 
 from . import DeviceTuple, RfxtrxCommandEntity, async_setup_platform_entry
@@ -24,9 +25,9 @@ from .const import (
 _LOGGER = logging.getLogger(__name__)
 
 
-def supported(event: rfxtrxmod.RFXtrxEvent):
+def supported(event: rfxtrxmod.RFXtrxEvent) -> bool:
     """Return whether an event supports cover."""
-    return event.device.known_to_be_rollershutter
+    return bool(event.device.known_to_be_rollershutter)
 
 
 async def async_setup_entry(
@@ -40,8 +41,8 @@ async def async_setup_entry(
         event: rfxtrxmod.RFXtrxEvent,
         auto: rfxtrxmod.RFXtrxEvent | None,
         device_id: DeviceTuple,
-        entity_info: dict,
-    ):
+        entity_info: dict[str, Any],
+    ) -> list[Entity]:
         return [
             RfxtrxCover(
                 event.device,
@@ -144,7 +145,7 @@ class RfxtrxCover(RfxtrxCommandEntity, CoverEntity):
         self._attr_is_closed = False
         self.async_write_ha_state()
 
-    def _apply_event(self, event: rfxtrxmod.RFXtrxEvent):
+    def _apply_event(self, event: rfxtrxmod.RFXtrxEvent) -> None:
         """Apply command from rfxtrx."""
         assert isinstance(event, rfxtrxmod.ControlEvent)
         super()._apply_event(event)
@@ -154,7 +155,9 @@ class RfxtrxCover(RfxtrxCommandEntity, CoverEntity):
             self._attr_is_closed = True
 
     @callback
-    def _handle_event(self, event: rfxtrxmod.RFXtrxEvent, device_id: DeviceTuple):
+    def _handle_event(
+        self, event: rfxtrxmod.RFXtrxEvent, device_id: DeviceTuple
+    ) -> None:
         """Check if event applies to me and update."""
         if device_id != self._device_id:
             return
diff --git a/homeassistant/components/rfxtrx/device_action.py b/homeassistant/components/rfxtrx/device_action.py
index e8fc8c6707d..15595b88cd2 100644
--- a/homeassistant/components/rfxtrx/device_action.py
+++ b/homeassistant/components/rfxtrx/device_action.py
@@ -1,6 +1,8 @@
 """Provides device automations for RFXCOM RFXtrx."""
 from __future__ import annotations
 
+from collections.abc import Callable
+
 import voluptuous as vol
 
 from homeassistant.components.device_automation.exceptions import (
@@ -65,7 +67,9 @@ async def async_get_actions(
     return actions
 
 
-def _get_commands(hass, device_id, action_type):
+def _get_commands(
+    hass: HomeAssistant, device_id: str, action_type: str
+) -> tuple[dict[str, str], Callable[..., None]]:
     device = async_get_device_object(hass, device_id)
     send_fun = getattr(device, action_type)
     commands = getattr(device, ACTION_SELECTION[action_type], {})
diff --git a/homeassistant/components/rfxtrx/helpers.py b/homeassistant/components/rfxtrx/helpers.py
index 7e567cff1cd..2badc6d4ca5 100644
--- a/homeassistant/components/rfxtrx/helpers.py
+++ b/homeassistant/components/rfxtrx/helpers.py
@@ -1,14 +1,14 @@
 """Provides helpers for RFXtrx."""
 
 
-from RFXtrx import get_device
+from RFXtrx import RFXtrxDevice, get_device
 
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers import device_registry as dr
 
 
 @callback
-def async_get_device_object(hass: HomeAssistant, device_id):
+def async_get_device_object(hass: HomeAssistant, device_id: str) -> RFXtrxDevice:
     """Get a device for the given device registry id."""
     device_registry = dr.async_get(hass)
     registry_device = device_registry.async_get(device_id)
diff --git a/homeassistant/components/rfxtrx/light.py b/homeassistant/components/rfxtrx/light.py
index 7f32ee0bc83..ad84515d41d 100644
--- a/homeassistant/components/rfxtrx/light.py
+++ b/homeassistant/components/rfxtrx/light.py
@@ -10,6 +10,7 @@ from homeassistant.components.light import ATTR_BRIGHTNESS, ColorMode, LightEnti
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import STATE_ON
 from homeassistant.core import HomeAssistant, callback
+from homeassistant.helpers.entity import Entity
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 
 from . import DeviceTuple, RfxtrxCommandEntity, async_setup_platform_entry
@@ -18,7 +19,7 @@ from .const import COMMAND_OFF_LIST, COMMAND_ON_LIST
 _LOGGER = logging.getLogger(__name__)
 
 
-def supported(event: rfxtrxmod.RFXtrxEvent):
+def supported(event: rfxtrxmod.RFXtrxEvent) -> bool:
     """Return whether an event supports light."""
     return (
         isinstance(event.device, rfxtrxmod.LightingDevice)
@@ -37,8 +38,8 @@ async def async_setup_entry(
         event: rfxtrxmod.RFXtrxEvent,
         auto: rfxtrxmod.RFXtrxEvent | None,
         device_id: DeviceTuple,
-        entity_info: dict,
-    ):
+        entity_info: dict[str, Any],
+    ) -> list[Entity]:
         return [
             RfxtrxLight(
                 event.device,
@@ -91,7 +92,7 @@ class RfxtrxLight(RfxtrxCommandEntity, LightEntity):
         self._attr_brightness = 0
         self.async_write_ha_state()
 
-    def _apply_event(self, event: rfxtrxmod.RFXtrxEvent):
+    def _apply_event(self, event: rfxtrxmod.RFXtrxEvent) -> None:
         """Apply command from rfxtrx."""
         assert isinstance(event, rfxtrxmod.ControlEvent)
         super()._apply_event(event)
@@ -105,7 +106,9 @@ class RfxtrxLight(RfxtrxCommandEntity, LightEntity):
             self._attr_is_on = brightness > 0
 
     @callback
-    def _handle_event(self, event, device_id):
+    def _handle_event(
+        self, event: rfxtrxmod.RFXtrxEvent, device_id: DeviceTuple
+    ) -> None:
         """Check if event applies to me and update."""
         if device_id != self._device_id:
             return
diff --git a/homeassistant/components/rfxtrx/sensor.py b/homeassistant/components/rfxtrx/sensor.py
index c3524b022f8..b4d4d65295c 100644
--- a/homeassistant/components/rfxtrx/sensor.py
+++ b/homeassistant/components/rfxtrx/sensor.py
@@ -3,9 +3,12 @@ from __future__ import annotations
 
 from collections.abc import Callable
 from dataclasses import dataclass
+from datetime import date, datetime
+from decimal import Decimal
 import logging
+from typing import Any, cast
 
-from RFXtrx import ControlEvent, RFXtrxEvent, SensorEvent
+from RFXtrx import ControlEvent, RFXtrxDevice, RFXtrxEvent, SensorEvent
 
 from homeassistant.components.sensor import (
     SensorDeviceClass,
@@ -30,8 +33,9 @@ from homeassistant.const import (
     UV_INDEX,
 )
 from homeassistant.core import HomeAssistant, callback
-from homeassistant.helpers.entity import EntityCategory
+from homeassistant.helpers.entity import Entity, EntityCategory
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.typing import StateType
 
 from . import DeviceTuple, RfxtrxEntity, async_setup_platform_entry, get_rfx_object
 from .const import ATTR_EVENT
@@ -39,14 +43,14 @@ from .const import ATTR_EVENT
 _LOGGER = logging.getLogger(__name__)
 
 
-def _battery_convert(value):
+def _battery_convert(value: int | None) -> int | None:
     """Battery is given as a value between 0 and 9."""
     if value is None:
         return None
     return (value + 1) * 10
 
 
-def _rssi_convert(value):
+def _rssi_convert(value: int | None) -> str | None:
     """Rssi is given as dBm value."""
     if value is None:
         return None
@@ -57,7 +61,9 @@ def _rssi_convert(value):
 class RfxtrxSensorEntityDescription(SensorEntityDescription):
     """Description of sensor entities."""
 
-    convert: Callable = lambda x: x
+    convert: Callable[[Any], StateType | date | datetime | Decimal] = lambda x: cast(
+        StateType, x
+    )
 
 
 SENSOR_TYPES = (
@@ -243,16 +249,16 @@ async def async_setup_entry(
 ) -> None:
     """Set up config entry."""
 
-    def _supported(event):
+    def _supported(event: RFXtrxEvent) -> bool:
         return isinstance(event, (ControlEvent, SensorEvent))
 
     def _constructor(
         event: RFXtrxEvent,
         auto: RFXtrxEvent | None,
         device_id: DeviceTuple,
-        entity_info: dict,
-    ):
-        entities: list[RfxtrxSensor] = []
+        entity_info: dict[str, Any],
+    ) -> list[Entity]:
+        entities: list[Entity] = []
         for data_type in set(event.values) & set(SENSOR_TYPES_DICT):
             entities.append(
                 RfxtrxSensor(
@@ -271,14 +277,22 @@ async def async_setup_entry(
 
 
 class RfxtrxSensor(RfxtrxEntity, SensorEntity):
-    """Representation of a RFXtrx sensor."""
+    """Representation of a RFXtrx sensor.
+
+    Since all repeated events have meaning, these types of sensors
+    need to have force update enabled.
+    """
 
     _attr_force_update = True
-    """We should force updates. Repeated states have meaning."""
-
     entity_description: RfxtrxSensorEntityDescription
 
-    def __init__(self, device, device_id, entity_description, event=None):
+    def __init__(
+        self,
+        device: RFXtrxDevice,
+        device_id: DeviceTuple,
+        entity_description: RfxtrxSensorEntityDescription,
+        event: RFXtrxEvent | None = None,
+    ) -> None:
         """Initialize the sensor."""
         super().__init__(device, device_id, event=event)
         self.entity_description = entity_description
@@ -296,7 +310,7 @@ class RfxtrxSensor(RfxtrxEntity, SensorEntity):
             self._apply_event(get_rfx_object(event))
 
     @property
-    def native_value(self):
+    def native_value(self) -> StateType | date | datetime | Decimal:
         """Return the state of the sensor."""
         if not self._event:
             return None
@@ -304,7 +318,7 @@ class RfxtrxSensor(RfxtrxEntity, SensorEntity):
         return self.entity_description.convert(value)
 
     @callback
-    def _handle_event(self, event, device_id):
+    def _handle_event(self, event: RFXtrxEvent, device_id: DeviceTuple) -> None:
         """Check if event applies to me and update."""
         if device_id != self._device_id:
             return
diff --git a/homeassistant/components/rfxtrx/siren.py b/homeassistant/components/rfxtrx/siren.py
index 0b49a7d4d8c..c9f10febb6b 100644
--- a/homeassistant/components/rfxtrx/siren.py
+++ b/homeassistant/components/rfxtrx/siren.py
@@ -58,8 +58,8 @@ async def async_setup_entry(
         event: rfxtrxmod.RFXtrxEvent,
         auto: rfxtrxmod.RFXtrxEvent | None,
         device_id: DeviceTuple,
-        entity_info: dict,
-    ):
+        entity_info: dict[str, Any],
+    ) -> list[Entity]:
         """Construct a entity from an event."""
         device = event.device
 
@@ -85,6 +85,7 @@ async def async_setup_entry(
                         auto,
                     )
                 ]
+        return []
 
     await async_setup_platform_entry(
         hass, config_entry, async_add_entities, supported, _constructor
diff --git a/homeassistant/components/rfxtrx/switch.py b/homeassistant/components/rfxtrx/switch.py
index c73b0ba3b1d..edc34aeb80d 100644
--- a/homeassistant/components/rfxtrx/switch.py
+++ b/homeassistant/components/rfxtrx/switch.py
@@ -10,6 +10,7 @@ from homeassistant.components.switch import SwitchEntity
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import CONF_COMMAND_OFF, CONF_COMMAND_ON, STATE_ON
 from homeassistant.core import HomeAssistant, callback
+from homeassistant.helpers.entity import Entity
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 
 from . import (
@@ -31,7 +32,7 @@ DATA_SWITCH = f"{DOMAIN}_switch"
 _LOGGER = logging.getLogger(__name__)
 
 
-def supported(event):
+def supported(event: rfxtrxmod.RFXtrxEvent) -> bool:
     """Return whether an event supports switch."""
     return (
         isinstance(event.device, rfxtrxmod.LightingDevice)
@@ -52,8 +53,8 @@ async def async_setup_entry(
         event: rfxtrxmod.RFXtrxEvent,
         auto: rfxtrxmod.RFXtrxEvent | None,
         device_id: DeviceTuple,
-        entity_info: dict,
-    ):
+        entity_info: dict[str, Any],
+    ) -> list[Entity]:
         return [
             RfxtrxSwitch(
                 event.device,
@@ -97,7 +98,7 @@ class RfxtrxSwitch(RfxtrxCommandEntity, SwitchEntity):
             if old_state is not None:
                 self._attr_is_on = old_state.state == STATE_ON
 
-    def _apply_event_lighting4(self, event: rfxtrxmod.RFXtrxEvent):
+    def _apply_event_lighting4(self, event: rfxtrxmod.RFXtrxEvent) -> None:
         """Apply event for a lighting 4 device."""
         if self._data_bits is not None:
             cmdstr = get_pt2262_cmd(event.device.id_string, self._data_bits)
diff --git a/mypy.ini b/mypy.ini
index 827d47d12ba..c77934d958a 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -1882,6 +1882,16 @@ disallow_untyped_defs = true
 warn_return_any = true
 warn_unreachable = true
 
+[mypy-homeassistant.components.rfxtrx.*]
+check_untyped_defs = true
+disallow_incomplete_defs = true
+disallow_subclassing_any = true
+disallow_untyped_calls = true
+disallow_untyped_decorators = true
+disallow_untyped_defs = true
+warn_return_any = true
+warn_unreachable = true
+
 [mypy-homeassistant.components.rhasspy.*]
 check_untyped_defs = true
 disallow_incomplete_defs = true