Use device class enum instead of string (#82935)

homeassistant/components/ring/sensor.py

@@ -206,7 +206,7 @@ SENSOR_TYPES: tuple[RingSensorEntityDescription, ...] = (
         name="Battery",
         category=["doorbots", "authorized_doorbots", "stickup_cams"],
         native_unit_of_measurement=PERCENTAGE,
-        device_class="battery",
+        device_class=SensorDeviceClass.BATTERY,
         cls=RingSensor,
     ),
     RingSensorEntityDescription(
@@ -255,7 +255,7 @@ SENSOR_TYPES: tuple[RingSensorEntityDescription, ...] = (
         category=["chimes", "doorbots", "authorized_doorbots", "stickup_cams"],
         native_unit_of_measurement=SIGNAL_STRENGTH_DECIBELS_MILLIWATT,
         icon="mdi:wifi",
-        device_class="signal_strength",
+        device_class=SensorDeviceClass.SIGNAL_STRENGTH,
         cls=HealthDataRingSensor,
     ),
 )

homeassistant/components/vultr/binary_sensor.py

@@ -5,7 +5,11 @@ import logging
 
 import voluptuous as vol
 
-from homeassistant.components.binary_sensor import PLATFORM_SCHEMA, BinarySensorEntity
+from homeassistant.components.binary_sensor import (
+    PLATFORM_SCHEMA,
+    BinarySensorDeviceClass,
+    BinarySensorEntity,
+)
 from homeassistant.const import CONF_NAME
 from homeassistant.core import HomeAssistant
 import homeassistant.helpers.config_validation as cv
@@ -32,7 +36,6 @@ from . import (
 
 _LOGGER = logging.getLogger(__name__)
 
-DEFAULT_DEVICE_CLASS = "power"
 DEFAULT_NAME = "Vultr {}"
 PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
     {
@@ -64,7 +67,7 @@ def setup_platform(
 class VultrBinarySensor(BinarySensorEntity):
     """Representation of a Vultr subscription sensor."""
 
-    _attr_device_class = DEFAULT_DEVICE_CLASS
+    _attr_device_class = BinarySensorDeviceClass.POWER
 
     def __init__(self, vultr, subscription, name):
         """Initialize a new Vultr binary sensor."""

homeassistant/components/wirelesstag/sensor.py

@@ -47,7 +47,7 @@ SENSOR_TYPES: dict[str, SensorEntityDescription] = {
     ),
     SENSOR_MOISTURE: SensorEntityDescription(
         key=SENSOR_MOISTURE,
-        device_class=SENSOR_MOISTURE,
+        device_class=SensorDeviceClass.MOISTURE,
         state_class=SensorStateClass.MEASUREMENT,
     ),
     SENSOR_LIGHT: SensorEntityDescription(