See who is at your door, no matter where you are! When somebody rings the bell or motion is detected, this smart doorbell lets you hear and speak to guests from your smartphone, tablet or PC. Uses the free Ring app. Records 720p HD video and has infrared night vision. Wi-Fi capable. Compatible with Android and iOS. You can use the built-in rechargeable battery (micro USB charger included) or connect it to existing doorbell wiring. Subscription required for cloud storage. 2 1/2" w x 5" h.