Google - Nest Wire-Free Video Doorbell (Battery) White

The Nest Doorbell is the battery-powered video doorbell that works with any home. See what’s happening at your door and answer it from anywhere. Expecting a delivery? It has a taller field of view, so you can see people in full or boxes on the ground. It can tell the difference between people, packages and vehicles, so you only get notified about what’s important to you. You can even use pre-recorded responses, like "You can just leave it. Thanks!" with 3 hours of free event video history, you can go back and see what you missed. And because there are no wires, you can install it yourself.