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).

Get two-year battery life, even at long range Blink's patented chip technology unlocks up to two years of battery life when used with a Sync Module XR and Energizer Lithium AA batteries (both included).