General building door intercom unit unlock lock doorbell home old-fashioned access control intercom indoor unit 2456 line

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Tools

Color classification:: General Purpose 2-Line Telephone (White) General Purpose 4-Wire Direct Press Phone (White) General Purpose 5-Wire Direct Press Phone (White) General Purpose 5-Wire Extension Ring Direct Press (White) General Purpose 2 Line Phone (Gold) General Purpose 4-Wire Direct Press Phone (Gold) General Purpose 5 Line Direct Press Phone (Gold) General Purpose 5 Line Extension Ring Direct Press (Gold) Universal 2 Line Phone (Black) General Purpose 4 Line Direct Press Phone (Black) Universal 5 Line Direct Press Phone (Black) 5 Line Extension Ring Direct Press (Black) Universal 2 Line Phone (Silver) General Purpose 4 Line Direct Press Phone (Silver) Universal 4 Line Direct Press Phone (Silver) Universal 5-wire direct press phone (silver) 5 line extension ring direct press (silver) 6 line direct press phone (message color) 4 line digital phone (message color) special 2 line (style is not optional) B-2 line phone white B-4 line direct press phone white

Compatible with most of the mainframes on the market:: You can contact customer service to guide the installation