... . 3.Adopt high-powered mic, substation is thin and compact, and appearance is handsome4.voice is lifelike, clear, the ... Easy Installation, only one wire for connecting master station and substation6.Have output for recording, can connect record external ... 150*120*68mmSubstation Size 95*85*20mm Packing: printed/white box 1 set/box. N.W. 0.9kg/ ... box office intercom for bank, hospital,post office and so on