diff --git a/homeassistant/components/concord232/binary_sensor.py b/homeassistant/components/concord232/binary_sensor.py
index 3077056c397..806fb5c513d 100644
--- a/homeassistant/components/concord232/binary_sensor.py
+++ b/homeassistant/components/concord232/binary_sensor.py
@@ -7,6 +7,7 @@ import requests
 import voluptuous as vol
 
 from homeassistant.components.binary_sensor import (
+    DEVICE_CLASS_SAFETY,
     DEVICE_CLASSES,
     PLATFORM_SCHEMA,
     BinarySensorEntity,
@@ -87,7 +88,7 @@ def get_opening_type(zone):
     if "MOTION" in zone["name"]:
         return "motion"
     if "KEY" in zone["name"]:
-        return "safety"
+        return DEVICE_CLASS_SAFETY
     if "SMOKE" in zone["name"]:
         return "smoke"
     if "WATER" in zone["name"]:
diff --git a/homeassistant/components/ffmpeg_noise/binary_sensor.py b/homeassistant/components/ffmpeg_noise/binary_sensor.py
index 6ada2bb2748..387f25afe6e 100644
--- a/homeassistant/components/ffmpeg_noise/binary_sensor.py
+++ b/homeassistant/components/ffmpeg_noise/binary_sensor.py
@@ -4,7 +4,7 @@ import logging
 import haffmpeg.sensor as ffmpeg_sensor
 import voluptuous as vol
 
-from homeassistant.components.binary_sensor import PLATFORM_SCHEMA
+from homeassistant.components.binary_sensor import DEVICE_CLASS_SOUND, PLATFORM_SCHEMA
 from homeassistant.components.ffmpeg import (
     CONF_EXTRA_ARGUMENTS,
     CONF_INITIAL_STATE,
@@ -84,4 +84,4 @@ class FFmpegNoise(FFmpegBinarySensor):
     @property
     def device_class(self):
         """Return the class of this sensor, from DEVICE_CLASSES."""
-        return "sound"
+        return DEVICE_CLASS_SOUND
diff --git a/homeassistant/components/meteoalarm/binary_sensor.py b/homeassistant/components/meteoalarm/binary_sensor.py
index b481b417b9e..6b13d03ebba 100644
--- a/homeassistant/components/meteoalarm/binary_sensor.py
+++ b/homeassistant/components/meteoalarm/binary_sensor.py
@@ -5,7 +5,11 @@ import logging
 from meteoalertapi import Meteoalert
 import voluptuous as vol
 
-from homeassistant.components.binary_sensor import PLATFORM_SCHEMA, BinarySensorEntity
+from homeassistant.components.binary_sensor import (
+    DEVICE_CLASS_SAFETY,
+    PLATFORM_SCHEMA,
+    BinarySensorEntity,
+)
 from homeassistant.const import ATTR_ATTRIBUTION, CONF_NAME
 import homeassistant.helpers.config_validation as cv
 
@@ -17,7 +21,6 @@ CONF_COUNTRY = "country"
 CONF_LANGUAGE = "language"
 CONF_PROVINCE = "province"
 
-DEFAULT_DEVICE_CLASS = "safety"
 DEFAULT_NAME = "meteoalarm"
 
 SCAN_INTERVAL = timedelta(minutes=30)
@@ -78,7 +81,7 @@ class MeteoAlertBinarySensor(BinarySensorEntity):
     @property
     def device_class(self):
         """Return the device class of this binary sensor."""
-        return DEFAULT_DEVICE_CLASS
+        return DEVICE_CLASS_SAFETY
 
     def update(self):
         """Update device state."""
diff --git a/homeassistant/components/mysensors/binary_sensor.py b/homeassistant/components/mysensors/binary_sensor.py
index 0bab6ea6eea..406f82c845e 100644
--- a/homeassistant/components/mysensors/binary_sensor.py
+++ b/homeassistant/components/mysensors/binary_sensor.py
@@ -1,6 +1,9 @@
 """Support for MySensors binary sensors."""
 from homeassistant.components import mysensors
 from homeassistant.components.binary_sensor import (
+    DEVICE_CLASS_SAFETY,
+    DEVICE_CLASS_SOUND,
+    DEVICE_CLASS_VIBRATION,
     DEVICE_CLASSES,
     DOMAIN,
     BinarySensorEntity,
@@ -11,10 +14,10 @@ SENSORS = {
     "S_DOOR": "door",
     "S_MOTION": "motion",
     "S_SMOKE": "smoke",
-    "S_SPRINKLER": "safety",
-    "S_WATER_LEAK": "safety",
-    "S_SOUND": "sound",
-    "S_VIBRATION": "vibration",
+    "S_SPRINKLER": DEVICE_CLASS_SAFETY,
+    "S_WATER_LEAK": DEVICE_CLASS_SAFETY,
+    "S_SOUND": DEVICE_CLASS_SOUND,
+    "S_VIBRATION": DEVICE_CLASS_VIBRATION,
     "S_MOISTURE": "moisture",
 }
 
diff --git a/homeassistant/components/nest/binary_sensor.py b/homeassistant/components/nest/binary_sensor.py
index dd52e1d665f..d4c9b6ca35d 100644
--- a/homeassistant/components/nest/binary_sensor.py
+++ b/homeassistant/components/nest/binary_sensor.py
@@ -2,7 +2,10 @@
 from itertools import chain
 import logging
 
-from homeassistant.components.binary_sensor import BinarySensorEntity
+from homeassistant.components.binary_sensor import (
+    DEVICE_CLASS_SOUND,
+    BinarySensorEntity,
+)
 from homeassistant.const import CONF_MONITORED_CONDITIONS
 
 from . import CONF_BINARY_SENSORS, DATA_NEST, DATA_NEST_CONFIG, NestSensorDevice
@@ -20,7 +23,7 @@ CLIMATE_BINARY_TYPES = {
 
 CAMERA_BINARY_TYPES = {
     "motion_detected": "motion",
-    "sound_detected": "sound",
+    "sound_detected": DEVICE_CLASS_SOUND,
     "person_detected": "occupancy",
 }
 
diff --git a/homeassistant/components/smartthings/binary_sensor.py b/homeassistant/components/smartthings/binary_sensor.py
index 825cf149952..4e555aece22 100644
--- a/homeassistant/components/smartthings/binary_sensor.py
+++ b/homeassistant/components/smartthings/binary_sensor.py
@@ -3,7 +3,10 @@ from typing import Optional, Sequence
 
 from pysmartthings import Attribute, Capability
 
-from homeassistant.components.binary_sensor import BinarySensorEntity
+from homeassistant.components.binary_sensor import (
+    DEVICE_CLASS_SOUND,
+    BinarySensorEntity,
+)
 
 from . import SmartThingsEntity
 from .const import DATA_BROKERS, DOMAIN
@@ -25,7 +28,7 @@ ATTRIB_TO_CLASS = {
     Attribute.filter_status: "problem",
     Attribute.motion: "motion",
     Attribute.presence: "presence",
-    Attribute.sound: "sound",
+    Attribute.sound: DEVICE_CLASS_SOUND,
     Attribute.tamper: "problem",
     Attribute.valve: "opening",
     Attribute.water: "moisture",
diff --git a/homeassistant/components/wink/binary_sensor.py b/homeassistant/components/wink/binary_sensor.py
index d8967dd064d..34bb4feee56 100644
--- a/homeassistant/components/wink/binary_sensor.py
+++ b/homeassistant/components/wink/binary_sensor.py
@@ -3,7 +3,11 @@ import logging
 
 import pywink
 
-from homeassistant.components.binary_sensor import BinarySensorEntity
+from homeassistant.components.binary_sensor import (
+    DEVICE_CLASS_SOUND,
+    DEVICE_CLASS_VIBRATION,
+    BinarySensorEntity,
+)
 
 from . import DOMAIN, WinkDevice
 
@@ -12,17 +16,17 @@ _LOGGER = logging.getLogger(__name__)
 # These are the available sensors mapped to binary_sensor class
 SENSOR_TYPES = {
     "brightness": "light",
-    "capturing_audio": "sound",
+    "capturing_audio": DEVICE_CLASS_SOUND,
     "capturing_video": None,
     "co_detected": "gas",
     "liquid_detected": "moisture",
-    "loudness": "sound",
+    "loudness": DEVICE_CLASS_SOUND,
     "motion": "motion",
-    "noise": "sound",
+    "noise": DEVICE_CLASS_SOUND,
     "opened": "opening",
     "presence": "occupancy",
     "smoke_detected": "smoke",
-    "vibration": "vibration",
+    "vibration": DEVICE_CLASS_VIBRATION,
 }