51 headset usb headset stereo pc headset design over ear types dynamic closed transmission mode cable types of connection usb 4x 35mm jack usb 20 bluetooth version bluetooth 30 type of cable single sided length of cable 36 m sound modes 51 hardware surround headset type of headphones headband features intergrated sound card adjustable headband padded headband in line control led indicator passive noise cancellation volume control functions mut