This is a Wired Silver 5" LCD Four Wires Handsfree Color Video Door Phone. When Doorbell is rung, the picture of the visitor will automatically be displayed. You can even communicate with them through intercom system without having to open the door at all. It provides an extra security and convenience for you and your family. The Video Doorbell is very easy to install and take off, electric lock-control function and handfree intercom. Your ideal choice!