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. Specification Item Type: USB Volume Control Knob Material: Iron Function: Computer Volume Control Length: Approx. 2m / 6.6ft Applicable Systems: for Win 10, 8, 7, for Vista, for XP, for OS X Package List 1 x Computer Volume Controller 1 x Data Cable 1 x User Manual