The wired Nest Doorbell can tell the difference between a person, package, animal, and vehicle; get alerts about the things that matter most to you, no subscription required[1].Field of viewe : 145° diagonal with 3:4 ratio | Get peace of mind knowing you can check your video doorbell 24/7 without having to recharge batteries[1] | See what you missed with 3 hours of free event video history included in the Google Home app; watch 2-second previews and 5-minute clips of important activity | The Nest Doorbell requires the Google Home app and a free Google account; it’s not compatible with the Nest app or the Nest site | Get up to 30 days of event video history and familiar face detection with a Nest Aware subscription, or choose a Nest Aware Plus subscription for even more benefits, like up to 10 days of continuous video recording[2,3] | The wired Nest Doorbell is designed to replace a wired doorbell and requires a compatible chime and transformer (both sold separately)[4]; you may need to replace existing hardware | Use compatible smart devices that work with Google Assistant or Amazon Alexa to stream your live video feed or see and talk to people at your door; plus, use compatible Nest and Amazon Alexa speakers as a doorbell chime | Chat through the doorbell to let friends know you’ll be right there or tell a delivery person where to leave a package[1]; or quickly respond to visitors with pre-recorded messages[1] | It’s beautifully designed to complement any home and made with 43% post-consumer recycled materials, so it’s a great choice for you and the planet[5] | Please refer to the product description section below for all applicable legal disclaimers denoted by the bracketed numbers in the preceding bullet points (e.g., [1], [2], etc.)