U-Voice UVS70D H4P Detachable Mini Headset Microphone for Audio Technica (Tan Color) Ultra Light Weight, Easy Clip-on Style & Bendable Boom for Comfortable Use Polar Pattern : Omnidirectional Impedance : 1,500 Ohms +/- 30% (at 1 Khz) Detachable Cable Compatible with Audio-Technica body pack transmitters: T27, T31, T51, T200, T210, T300, T310, 700 Series, 1100 Series, 1400 Series, 2000 Series, 3000 Series. (Bodypack Transmitter not included)