EXTRA BASS WIRED HEADSET VHD1-04 Comfortable to wear 3.5mm Jack Stereo Sound Microphone Available Colours Black & Red SPEAKER Driver Unit : φ40mm Impedance : 32±15%Ω Sensitivity : 100±5dB at 1KHz Frequency Response : 20Hz-20KHz Rated Power : 20mW Cable Length : 1.5M Plug Type : 1*3.5mm MICROPHONE Mic Unit : φ4mm Impedance : 2.2KΩ Mic Directivity : Omnidirectional Sensitivity : -48±3dB at 1KHz Frequency Response : 100Hz-10KHz Standard Operating Voltage : 3V