Sync Module XR Included. Color Doorbell Black. Last longer with two-year battery life — Experience up to two years of continuous security coverage for Video Doorbell and Outdoor 4 with three AA Energizer lithium batteries and a Blink Sync Module (both included).

Easily install Blink Video Doorbell wire-free or connect to existing doorbell wiring. Once paired with your Blink Sync Module, enjoy up totwo years of powerful battery life, so you can always know who's there.