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Your Door-to-Phone Intercom Solution is here. Bring Convenience, Security & Assistance to your home today with the DOORBELL FON™. This amazing product allows users to answer a door or gate from any telephone in their home or business. It installs using a single pair of wires for power, control, signaling & voice. All add-on components install on same single pair. No Programming! No Codes! Just pick up the telephone like a regular telephone call.