Building on the success of the HS-09, the HS-10 offers many brand new features and available options. Three sizes of interchangeable Flex-Fit earpieces ensure that a comfortable, secure fit is achieved every time, while the long and short boom (this listing is for the long boom) options provide a perfect solution for a variety of applications. \\ TECHNICAL INFORMATION: Mic Element: Back Electret ' Polar Pattern: Omni-Directional ' Frequency Response: 20Hz - 20kHz ' Sensitivity: -35 +/-3dB 1V/Pa ' Output Impedance: 2kO +/-30%' SPL Max: 140dB ' Operating Voltage: 0.8 - 5V ' Weight: 13g ' Mic Dimensions: 3mm