The Ring Video Doorbell is the world's first battery-operated, wi-fi enabled, HD video doorbell. This device enables homeowners to see and speak with visitors from anywhere in the world by streaming live audio and video of a home's front doorstep directly to the free iOS or Android app. Alerts and live video triggered by motion detection or ringing the doorbell. The doorbell's built-in motion sensors (along with night vision) detect movement up to 30 feet, and HD video recording stores all recorded footage to the cloud which can be accessed via the Ring app. The Ring Doorbell is quick and easy to set up as it mounts and syncs in minutes and has a built-in rechargeable battery, however, it can also be powered through existing doorbell wiring.