MODEL NO.  MH-660   ADJUSTABLE EARSET MICROPHONE       Adjustable boom made of soft meteral for easy and comfortable adjustment   Model No. MH-660 Element Back Electret Condenser Polar Pattern Omni-directional Frequency Response 20Hz-20KHz Sensitivity -66dB±3dB Output Impedance 1.5KΩ±30% Max/Standard Voltage 10/1.5V Dimensions Φ4x11mm Accessory windscreen