Cardioid Condenser Boundary Microphone.Operating Principle: CondenserPolar Pattern: CardioidFrequency Response:100Hz to 7KHzSensitivity:-35dBV (18mV) @ 1 PaImpedance:440 ohmsSelf Noise:26dBAPower Requirements:P12,P24,P48, 5mAChoir, Podium, Stage, Boardroom/Conference.