diff --git a/homeassistant/components/demo/const.py b/homeassistant/components/demo/const.py
new file mode 100644
index 00000000000..e11b0b0731a
--- /dev/null
+++ b/homeassistant/components/demo/const.py
@@ -0,0 +1,3 @@
+"""Constants for the Demo component."""
+DOMAIN = "demo"
+SERVICE_RANDOMIZE_DEVICE_TRACKER_DATA = "randomize_device_tracker_data"
diff --git a/homeassistant/components/demo/device_tracker.py b/homeassistant/components/demo/device_tracker.py
index fba8095efd6..02864111527 100644
--- a/homeassistant/components/demo/device_tracker.py
+++ b/homeassistant/components/demo/device_tracker.py
@@ -1,7 +1,7 @@
 """Demo platform for the Device tracker component."""
 import random
 
-from homeassistant.components.device_tracker import DOMAIN
+from .const import DOMAIN, SERVICE_RANDOMIZE_DEVICE_TRACKER_DATA
 
 
 def setup_scanner(hass, config, see, discovery_info=None):
@@ -36,6 +36,6 @@ def setup_scanner(hass, config, see, discovery_info=None):
         battery=53,
     )
 
-    hass.services.register(DOMAIN, "demo", observe)
+    hass.services.register(DOMAIN, SERVICE_RANDOMIZE_DEVICE_TRACKER_DATA, observe)
 
     return True
diff --git a/homeassistant/components/demo/services.yaml b/homeassistant/components/demo/services.yaml
index e69de29bb2d..a8a96b21c19 100644
--- a/homeassistant/components/demo/services.yaml
+++ b/homeassistant/components/demo/services.yaml
@@ -0,0 +1,2 @@
+randomize_device_tracker_data:
+  description: Demonstrates using a device tracker to see where devices are located
\ No newline at end of file