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