We are manufacturer, professional conference microphones. 1, 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+_2dBFrequency response: 60Hz-15KHzOutput impedance: 200ΩOutput power: AC220V/50HzThe master ...