Commax TP12RC 12 ID Setting Enable Calls Interphone.Variable system composition(6 or 12 units), ID setting enabled with dip switch, Effective calling to all units by paging function.Variable system composition(TP-6RC: 6 units/ TP-12RC: 12 units), ID setting enabled with dip switch,Effective calling to all units by paging function, Doorlock release , Calling & paging,Product Dimensions : 11.60 cm x 65.00 cm x 20.80 cm.