diff --git a/homeassistant/components/edl21/sensor.py b/homeassistant/components/edl21/sensor.py
index 65ca1ee9050..d2d0d375733 100644
--- a/homeassistant/components/edl21/sensor.py
+++ b/homeassistant/components/edl21/sensor.py
@@ -10,13 +10,15 @@ import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA, SensorEntity
 from homeassistant.const import CONF_NAME
-from homeassistant.core import callback
+from homeassistant.core import HomeAssistant, callback
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.dispatcher import (
     async_dispatcher_connect,
     async_dispatcher_send,
 )
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.entity_registry import async_get_registry
+from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 from homeassistant.util.dt import utcnow
 
 _LOGGER = logging.getLogger(__name__)
@@ -35,7 +37,12 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
 )
 
 
-async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
+async def async_setup_platform(
+    hass: HomeAssistant,
+    config: ConfigType,
+    async_add_entities: AddEntitiesCallback,
+    discovery_info: DiscoveryInfoType | None = None,
+) -> None:
     """Set up the EDL21 sensor."""
     hass.data[DOMAIN] = EDL21(hass, config, async_add_entities)
     await hass.data[DOMAIN].connect()
@@ -126,7 +133,7 @@ class EDL21:
 
     def __init__(self, hass, config, async_add_entities) -> None:
         """Initialize an EDL21 object."""
-        self._registered_obis: set[()] = set()
+        self._registered_obis: set[tuple[str, str]] = set()
         self._hass = hass
         self._async_add_entities = async_add_entities
         self._name = config[CONF_NAME]