diff --git a/homeassistant/components/xs1/entity.py b/homeassistant/components/xs1/entity.py
index c1ec43ec33c..61601066636 100644
--- a/homeassistant/components/xs1/entity.py
+++ b/homeassistant/components/xs1/entity.py
@@ -2,6 +2,8 @@
 
 import asyncio
 
+from xs1_api_client.device import XS1Device
+
 from homeassistant.helpers.entity import Entity
 
 # Lock used to limit the amount of concurrent update requests
@@ -13,7 +15,7 @@ UPDATE_LOCK = asyncio.Lock()
 class XS1DeviceEntity(Entity):
     """Representation of a base XS1 device."""
 
-    def __init__(self, device):
+    def __init__(self, device: XS1Device) -> None:
         """Initialize the XS1 device."""
         self.device = device
 
diff --git a/homeassistant/components/xs1/sensor.py b/homeassistant/components/xs1/sensor.py
index 26c009b15ee..d1411fe540b 100644
--- a/homeassistant/components/xs1/sensor.py
+++ b/homeassistant/components/xs1/sensor.py
@@ -3,6 +3,8 @@
 from __future__ import annotations
 
 from xs1_api_client.api_constants import ActuatorType
+from xs1_api_client.device.actuator import XS1Actuator
+from xs1_api_client.device.sensor import XS1Sensor
 
 from homeassistant.components.sensor import SensorEntity
 from homeassistant.core import HomeAssistant
@@ -20,8 +22,8 @@ def setup_platform(
     discovery_info: DiscoveryInfoType | None = None,
 ) -> None:
     """Set up the XS1 sensor platform."""
-    sensors = hass.data[DOMAIN][SENSORS]
-    actuators = hass.data[DOMAIN][ACTUATORS]
+    sensors: list[XS1Sensor] = hass.data[DOMAIN][SENSORS]
+    actuators: list[XS1Actuator] = hass.data[DOMAIN][ACTUATORS]
 
     sensor_entities = []
     for sensor in sensors:
@@ -35,16 +37,16 @@ def setup_platform(
                 break
 
         if not belongs_to_climate_actuator:
-            sensor_entities.append(XS1Sensor(sensor))
+            sensor_entities.append(XS1SensorEntity(sensor))
 
     add_entities(sensor_entities)
 
 
-class XS1Sensor(XS1DeviceEntity, SensorEntity):
+class XS1SensorEntity(XS1DeviceEntity, SensorEntity):
     """Representation of a Sensor."""
 
     @property
-    def name(self):
+    def name(self) -> str:
         """Return the name of the sensor."""
         return self.device.name()
 
@@ -54,6 +56,6 @@ class XS1Sensor(XS1DeviceEntity, SensorEntity):
         return self.device.value()
 
     @property
-    def native_unit_of_measurement(self):
+    def native_unit_of_measurement(self) -> str:
         """Return the unit of measurement."""
         return self.device.unit()
diff --git a/homeassistant/components/xs1/switch.py b/homeassistant/components/xs1/switch.py
index 5e107099515..232bd590c61 100644
--- a/homeassistant/components/xs1/switch.py
+++ b/homeassistant/components/xs1/switch.py
@@ -5,6 +5,7 @@ from __future__ import annotations
 from typing import Any
 
 from xs1_api_client.api_constants import ActuatorType
+from xs1_api_client.device.actuator import XS1Actuator
 
 from homeassistant.components.switch import SwitchEntity
 from homeassistant.core import HomeAssistant
@@ -22,7 +23,7 @@ def setup_platform(
     discovery_info: DiscoveryInfoType | None = None,
 ) -> None:
     """Set up the XS1 switch platform."""
-    actuators = hass.data[DOMAIN][ACTUATORS]
+    actuators: list[XS1Actuator] = hass.data[DOMAIN][ACTUATORS]
 
     add_entities(
         XS1SwitchEntity(actuator)
@@ -36,12 +37,12 @@ class XS1SwitchEntity(XS1DeviceEntity, SwitchEntity):
     """Representation of a XS1 switch actuator."""
 
     @property
-    def name(self):
+    def name(self) -> str:
         """Return the name of the device if any."""
         return self.device.name()
 
     @property
-    def is_on(self):
+    def is_on(self) -> bool:
         """Return true if switch is on."""
         return self.device.value() == 100