71 headset stereo pc headset usb headset design over ear type closed transmission mode cable types of connection usb 20 35mm jack type of cable single sided sound modes 71 software 20 hardware surround headset type of headphones headband features padded headband volume control led indicator function mute sound system dolby headphone headphone transmission range 20 20000 hz sensitivity 107 dbmw headphone impedance 32 ohm driver 50 mm