Answer door or gate from any telephone, each controller can operate 2 entry ways, distinctive tone for each, built in call waiting, 2 way communication, up to 4000' distance with CAT5 twisted pair cable, connects to 2 line/PBX/key stations, basic kit and all add on devices operate on 1 pair of wire, ivory. Intercom system.
Click link for PDF and Specs http://www.doorbellfon.com/homephone.htm *Note the DP-28iT includes two parts DP-28C DP-28NIT
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