YPA M1-C4SE LAVALIER CLIP ON CARDIOID MICROPHONE FOR SENNHEISER RADIO MIC High class back electret condenser microphone,High quality microphone capsule with uni-directional polar pattern For vocal, speech, dance and sport applications, for instrumental artists and solo entertainers Frequency response: 15 Hz to 16 kHz,SPL: max. 132 dB,Impedance: 600  ,Sensitivity: -45 dB Plug: safely screwws 3.5mm plus configuration for pocket transmitter The Compatible Transmitters:Sennheiser Evolution pocket transmitter series G1, G2 & freeport, EW100, EW300, EW500, SK1093;