TCP Smart wireless battery powered doorbell with camera that allows you to see who is at your door without being home. It also has 2 way communication, so you can talk to the visitor. Supplied as a complete kit that includes a chime, batteries, connectors and an installation tool kit.
It operates from the TCP Smart phone App which doesn't need an additional hub or gateway. Their are many other products in the TCP Smart series that can be added to your door bell system including smart bulbs, smart switches and smart sockets.