Blink Video Doorbell | Two-way audio, HD video, motion and chime app alerts, and Alexa enabled — wired or wire-free…

Answer your door no matter where you are from your smartphone with 1080p HD day and infrared night video and two-way audio.
Experience long-lasting battery life, custom alerts, privacy settings, and more.
Get alerts when motion is detected or anyone presses Video Doorbell. Connect to existing doorbell wiring or pair with a Sync Module (sold one at a time) to engage live view and two-way audio on demand.
Make a selection to save and share clips in the cloud with a free 30-day trial of the Blink Subscription Plan or in the neighborhood with the Sync Module 2 and USB drive (each and every sold one at a time).
Designed for each and every home, go wire-free or connect to existing doorbell wiring to also sound in-home chime.
Set up yourself 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 respond to 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 may also be found in all “Systems” above (really useful for optimal use even as on battery).