Answer your door from anywhere with your smartphone, thanks to 1080p HD day and infrared night video and two-way audio. Enjoy long-lasting battery life, custom alerts, privacy settings, and more. Get notified when motion is detected or someone presses the Video Doorbell. Connect to existing doorbell wiring or pair with a Sync Module (sold separately) for live view and two-way audio on demand. Save and share clips in the cloud with a free 30-day trial of the Blink Subscription Plan or locally with the Sync Module 2 and USB drive (each sold separately). Designed for every home, go wire-free or connect to doorbell wiring to also sound your existing in-home chime. Without wiring, use your Blink Mini camera (sold separately) as an indoor plug-in chime. Set up in minutes with the two included AA lithium batteries then connect to wifi in the app. Works with Alexa — receive alerts and answer with two-way audio. When wired or paired with a Sync Module, just ask Alexa to answer the front door. Includes one Video Doorbell, 2 AA 1.5V Lithium Batteries, 4 Screws, 1 Case Opening Tool. Does not include Sync Module 2 which can be found in all “Systems” above (recommended for optimal use while on battery).