The Ring Video Doorbell lets you answer the door from anywhere there is internet connection using your smartphone. It uses a HD camera with night vision. Motion-triggered alerts sent via the free Ring app (iOS and Android) notify you of arriving guests and deliveries.Cloud Recording enables you to view footage you were unable to see in real time. A built-in rechargeable battery lets you install the doorbell anywhere, or connect it to existing doorbell wiring. Product is also available with an optional chime bell that plugs into a powerpoint.