Easily install Blink Video Doorbell wire-free or connect to existing doorbell wiring. Once paired with your Blink Sync Module, enjoy up to two years of powerful battery life, so you can always know who's there. Our second-generation Video Doorbell provides a 150? head-to-toe field of view, allowing you to greet guests and watch packages get delivered in a 1:1 aspect ratio, day and night, with HD infrared night vision. In the box: Includes one Video Doorbell with three AA Energizer lithium batteries, one Sync Module Core with one USB-C cable and indoor power adapter, a mounting kit (including screws and anchors), and a corner mount.