WIDE APPLICATION: USB volume control knob is compatible with multiple systems, supports for Android and systems, and is compatible with mobile phones, tablets, laptops, and desktop computers. FUNCTIONS AND USES: USB volume controller can directly control the volume of the computer , can be customized, support shortcut keys.( Note: Custom functions require editing software, please contact customer service for editing software.) FLEXIBLE AND ROTATABLE: The spindle of the PC USB volume control knob supports 360° rotating, making it more strong and suitable for long periods of use. WITH LIGHT: USB volume controller knob with RGB light, can only switch, Type C interface, plug and use. EASY TO USE: There is no need to install any drivers or software on your computer to drive this volume regulator, and can be used after plugging in the device. Item Type: USB Volume Control Knob Features: Customizable; Support shortcut keys Support: For Android systems, for systems How to Use:Insert the USB cable, RGB lights turn on. the knob for 2 seconds to turn off the lights, again for 2 seconds to turn on the lights. Default volume control function, rotate CW to decrease volume, CCW to increase volume, for mute. Color: Black Material: Aluminum alloy + acrylic Package Contents: 1 x USB Volume Controller 1 x Type-C Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.