Features 1.[Various Compatibility]: The USB volume control knob is specifically designed for computers and is compatible with a wide range of operating systems, including for Win 10, 8, 7, for Vista, for XP, and for OS X. 2.[Easy to Use]: USB connection, plug and play, once it is plugged into the boot computer, you can turn the knob to adjust the volume of the computer easily and quickly. 3.[One Button Mute Function]: The controller knob supports one touch mute function, just press the knob, will immediately enter the mute state, and the sound will be recovered when it is pressed again. 4.[Long USB Cable]: The USB volume control knob comes with a long USB cable, the length is Approx. 2m / 6.6ft, suitable for use with desktop or laptop computers. 5.[Durable and Stable]: The volume remote controller knob is made from metal material and has anti slip pads on the buttons, suitable for watching videos, playing games, etc. specificationItem Type: USB Volume Control Knob_x000D_ Material: Iron_x000D_ Function: Computer Volume Control_x000D_ Length: Approx. 2m / 6.6ft_x000D_ Applicable Systems: for Win 10, 8, 7, for Vista, for XP, for OS X PackageList1 x ComputerVolumeController 1 x Data Cable 1 x User Manual