The Nest Doorbell includes intelligent alerts, which can tell the difference between a person, package, animal, and vehicle. See activity at your front door around the clock. Get peace of mind knowing you can check in 24/7 without having to recharge batteries.[1] Chat through the doorbell to let friends know you\'ll be right there. Or tell a delivery person where to leave a package.[1] Get a sharp, vivid view of your front doorstep. HDR helps you see details in sunlight or shadows, while Night Vision helps you see in the dark. Compatible with chimes rated to work with a 16-24VAC and 10VA doorbell transformer. [1]Some features, including mobile notifications, remote control, video streaming, and video recording, require working Internet and Wi-Fi.