DOORBELL FON ACNC DP29SW/IM OUTBOUND TRIGGER RELAY/INTERCOM MODULE

When a visitor presses the button on the door intercom, the DoorBell Fon rings the phones in your home with a distinctive ring. Pick up the phone to converse with the door. If you are on the phone when a visitor arrives a call waiting tone will sound to alert you. In fact, the DoorBell Fon system will even work without phone service. The system provides the necessary voltage to operate on it's own. Up to 2 intercom stations can be attached. Add the optional lock controller and an electric door strike and you can unlock the door from the phone by pressing "*". Easy 2 wire connection to door intercoms. Works with answering machines, most home PBX phone systems, and phone-company provided services like voice mail. Includes one door intercom station, which measures 3 7/8" X 5 1/8" X 1", and a power supply.