YPA M1-C4A LAVALIER CLIP ON CARDIOID MICROPHONE FOR AKG 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 TA3F plus configuration for pocket transmitter The Compatible Transmitters:AKG DPT700, PT60-80-81-400-450-4000-4500,Samson UT1L, VT2L;