Blink Smart Wi-Fi Video Doorbell Wired/Battery Operated with Sync Module 2 - Black Blink Video Doorbell Sync Module 2 2 1.5V non-rechargeable AA lithium metal batteries mounting kit (including corner mount screws and anchors) USB cable power adapter Blink - Smart Wi-Fi Video Doorbell – Wired/Battery Operated with Sync Module 2 - Black Description: Answer your door anytime anywhere from your smartphone with 1080p HD day and infrared night video and two-way audio thanks to the Blink Video Doorbell. Experience up to two years of powerful battery life custom alerts privacy settings and more. Designed for every home- Go wire-free or connect to existing doorbell wiring to also sound an in-home chime. Easy install- Set up yourself in minutes with the two included AA lithium batteries then connect to Wi-Fi in the app. Works with Alexa- Access live view two-way talk receive motion and chime alerts arm and disarm your doorbell and more. Choose to save and share clips in the cloud with a free 30-day trial of the Blink Subscription Plan. Pairing with a Sync Module 2 gives you the ability to expand your Blink system and experience additional features. When running the Video Doorbell on batteries using the Sync Module 2 is recommended. Blink Smart Wi-Fi Video Doorbell Wired/Battery Operated with Sync Module 2 Black Features: Answer your door- anytime anywhere Two-way audio HD video motion and chime app alerts and Alexa enabled — easy install 1080p HD day and infrared night video Two years of powerful battery life Designed for every home Easy install- set up yourself in minutes Access live view two-way talk Receive motion and chime alerts Arm and disarm your doorbell and more Go wire-free or connect to existing doorbell wiring Includes Blink Video Doorbell two sync modules two 1.5V non-rechargeable AA lithium metal batteries mounting kit (including corner mount screws and anchors) USB cable and power adapter