Features: 1.USB Connection: The computer volume controller is a USB connection, plug and play, ensuring easy and quick adjustment of the computer volume 2.One Key Mute: The USB volume control supports one key mute function, just press the knob, you can enter the mute state immediately, press again to restore the sound 3.2m/6.6ft Cable: The PC volume knob comes with a USB cable, about 2m/6.6ft long, suitable for use with a desktop or laptop 4.Wide Compatible: The USB volume control is specially designed for computer, compatible with for Win 10, for Win 8, for Win 7, for Win Vista, for Win XP, for OS X system 5.Metal Case: The speaker USB volume controller has a metal case with non slip pads at the buttons. Suitable for watching videos, playing games, etc specification:Item Type: USB Volume Control Material: Metal Colour: Black Scope of Application: Computer PackageList:1 x USB Volume Control 1 x Cable 1 x User Manual