Features 1.[High Compatibility]: The USB volume controller is specially designed for computer external volume control knob, and compatible with for Win 10, 8, 7, for Vista, for XP, for OS X, for Android system. 2.[Plug and Play]: 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]: 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.[4 Skid Resistant Pads]: The USB computer volume controller is attached with 4 anti slip pads on the bottom, which is not easy to move and very stable. 5.[Durable Metal]: The volume remote controller knob has metal casing with anti slip pads on the buttons, which is durable and stable, 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, for Android PackageList1 xUSBVolumeControl 1 x USB to Type C Data Cable 1 x Type C to Type C Data Cable 1 x User Manual