1.volume control 2.mute function 3.USB 2.0 plug 4.computer usb headphone 5.CE Computer usb Headphone Specification:volume controlmute functionUSB 2.0plugEarphone1) Impedance: 2 x 8, 2 x 16, 2 x 32, 2 x 402) Sensitivity: 110±3dB3) Frequency range: 20 - 20,000Hz4) Rated power: 2 x 100mWMicrophone1) Impedance: 1,800, 100, 2002) Sensitivity: -48±3dB3) Directivity: omnidirectional4) Frequency response ...