71 headset stereo pc headset usb headset base tube technology design over ear types dynamic closed transmission mode cable types of connection usb 35mm jack usb 20 length of cable 2 m sound modes 71 software surround headset type of headphones headband features in line control padded headband passive noise cancellation adjustable headband volume control sound systems dolby surround dolby headphone headphone transmission range 20 20000 hz driv