The newest Blink Video Doorbell delivers an expanded head-to-toe HD view so you can see guests and packages clearly, day or night, with infrared night vision and two-way talk through the Blink app. Powered by three AA Energizer lithium batteries and paired with the included Sync Module Core, it provides up to two years of battery life for long-lasting peace of mind. Install it wire-free in minutes or connect to existing doorbell wiring to sound through your home. With optional Blink Subscription features like person detection and clip storage, plus Alexa compatibility for voice control, it’s a simple, flexible way to upgrade your home security. Doorbell dimensions: 1.85" x 5.12" x 1.44". Sync Module Core dimensions: 3.19" x 1.77" x 0.85".