... for pcs 3,passed ISO,CE,Certificate e PROFESSIONAL WIRELESS CONFERENCE MICROPHONE 1,goose neck2,-47dB±2Db3,Alone one for ... every master system,and unit Expansion can store 180pcs Unit representative to take part in conference.2,Two Auxs conference microphone ... time.4,The chairman,representative master, head microphone within digital light circle display it.The chairman microphone function: Test ...