YPA M1-C4S LAVALIER CLIP ON CARDIOID MICROPHONE FOR SHURE 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 TA4F plus configuration for pocket transmitter The Compatible Transmitters:Line 6 XD-V70L,Shure PGX1/SC1/SLX1/ U1/ULX1/UR1/UR1M/UT1 Series,TOA WM4300 Series;