Answer your door no matter where you are 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 Get alerts when motion is detected or someone presses Video Doorbell. Pair with the Sync Module 2 (sold separately) or wire to engage any time 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 Works with Alexa—get notified when your doorbell is pressed and motion is detected. When wired, see, hear, and speak to visitors Choose to save and share clips in the cloud with a 30-day trial of the Blink Subscription Plan included with your purchase or locally with the Sync Module 2 and USB drive (sold separately)