The high-quality back electret condenser microphone is very filigree and from an especially light construction. The earset is distinguished by a very pleasant wearing comfort and is also suitable for wearers of glasses. The high-quality microphone capsule has very good sound and transmission characteristics for vocal and speech and it is applicable in all areas even by sports teachers and dancing instructors. By operating with a pocket transmitter the earset allows unlimited mobility to the user. Element: Back Electret Condenser Polar Pattern: Omni-Directional Frequency Response: 20Hz-20KHz Sensitivity: -46dB±3dB Max.Input SPL: 131dB(At 1KHz≤1% T.H.D) Power Supply: 1.5-12V DC Output Impedance: 2000Ω±30%(at 1KHz) Dimension(mm): Ø5mmWhat’s Included.In Original Box 1* ME2-C4S Headset microphone(Black) 1* Cable Clip(Black) 2* MMW2 Foam Windshield(Black)