Usb headset 71 headset design over ear transmission mode cable types of connection usb usb 20 length of cable 21 m sound modes 71 hardware surround headset type of headphones headband features in line control volume control function with vibration headphone transmission range 15 20000 hz sensitivity 108 dbmw headphone impedance 32 ohm driver 50 mm microphone properties noise cancelling microphone flexible microphone arm omni directional mic