Specification: Speaker Driver Unit: Ø30mm Impedance: 32ohm Sensitivity:105dBS.P.LAt1KHz Frequency Response: 20-20KHz Max.Power Input: 50mW Cord Length: 1.2m Plug: Ø3.5mm stereo plug Microphone Stye: electret condenser microphone Polar pattern: omni-directional Sensitivity: -58dB±3dB Impedance: Low Frequency Response: 30-16,000Hz Operating Voltage:3V