Model ZM-HPS310 Dimension 187(W)mm x 201(H)mm x 91(L)mm Interface USB Weight 243g(without cable) Cable Length & Type 2.2m Braided with Volume controller Color Black Speaker Driver Unit Size Φ50mm Speaker Impedance 32Ω ± 15% Speaker Operating Power(Max) 30mW Speaker Sensitivity 106 ± 3dB Speaker Frequency Response 20~20KHZ Microphone Size Φ6.0*2.7mm Microphone Sensitivity -42dB ± 3dB Microphone Type of MIC Omni directional Microphone S/N ratio 58dB Microphone Impedance ≤2.2KΩ