blink video doorbell + sync module

Answer your door anytime, anywhere from your smartphone with 1080p HD day and infrared night video and two-way audio
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 in-home chime
Set up yourself in minutes with the two included AA lithium batteries then connect to wifi in the app
With Alexa voice control, you can access live view, two-way talk, receive motion and chime alerts, arm and disarm your doorbell, and do more
Choose to save and share clips in the cloud with a 30-day trial (at no cost) of the Blink Subscription Plan or store locally with a Sync Module and USB drive (sold separately)