71 headset stereo pc headset usb headset design on ear type closed transmission mode cable types of connection usb 20 35mm jack sound modes surround headset 71 software type of headphones headband features in line control padded headband volume control collapsible function mute headphone transmission range 20 22000 hz sensitivity 97 dbmw headphone impedance 32 ohm driver 40 mm microphone properties noise cancelling microphone omni directi