71 headset stereo pc headset usb headset design on ear type closed transmission mode cable types of connection usb usb 20 type of cable single sided length of cable 2 m sound modes 71 software surround headset type of headphones earhook features adjustable headband intergrated sound card collapsible volume control control via headset function voip sound systems dolby headphone dolby prologic iix headphone transmission range 20 20000 hz drive