Enjoy a door intercom system that installs in minutes! This 3-Channel Door Intercom System communicates over your home's existing wiring -- no new wiring is required! With this Door Intercom, you'll be able to answer your doorbell from any room in your home.The 3-Channel Door Intercom System communicates via existing AC wires and will block X10 signals during the period that the intercoms are being used. They will not affect X10 operation if they're plugged in, but are not transmitting sound. The door intercom unit easily replaces your existing push-button doorbell using existing doorbell wiring.