Name:MT-HP021 Model No:φ50mm Speaker:120±3db Microphone:32Ω Impedance:20~20,000Hz Frequency Response:Omni-directional Mic Unit Diameter:φ6.0±5.0mm Mic Sensitivity:-35±3db Interface:φ3.5mm stereo jack plus USB Cable length:2.20±0.01m Dimensions:206*93*226mm Weight:395±5g