U-Voice UVS70D 35LS Detachable Mini Headset Microphone for Sennheiser (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 Sennheiser and Awisco Wireless Microphone System