... As for conference. 2, -47dB+_2dB. 3, 60Hz-15KHz. 4, 200ohm We are manufacturer, professional conference microphones.1, As for ... conference.2, -47dB+_2dB3,60HZ-15KHz.4,200ohm. Features:Turned mode: Electric capacityDirection: heartSensitivity: -47dB+ ... . and the press can out off all units representative working microphone. The unit representative: Everyone ( or every both) within ...