Connects to existing wires – requires 16-24VAC 10VA min, 50/60Hz 145° diagonal with 3:4 ratio Know who is at the door - talk and listen from anywhere Find out when a package arrives See when animals or vehicles come into view See the full pictue, from head to toe Get a clear view, day or night. Nonstop video – only with the wired Nest Doorbell - Get continuous video recording for up to 10 days with a Nest Aware subscription. (Sold separately) Google Home App required Voice assistant with Google Assistant, Alexa