The Door Station Controller is the DoorBell Fon interface - the "brain" of the DoorBell Fon system. This product allows users to answer a door or gate from any telephone in their home or business. It is installed using a single pair of wires for power, control, signaling, and voice: all add-on components are installed with the same pair. Operation is simple. No programming! No codes! Just answer the phone like a regular telephone call.
Click for PDF and Specs http://www.doorbellfon.com/product%20html/DP28C.htm
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