WIDE APPLICATION: USB volume control knob is Compatible with a variety of system devices, suitable for mobile phones, tablets, notebooks, desktop computers, compatible with Windows and Andriod systems. Support wired USB, wireless 2.4G dual mode, with a rotary encoder. FUNCTIONS AND USES: USB volume controller can directly control the volume of the computer operating system 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. Default volume control function, clockwise to reduce the volume, counterclockwise to increase the volume, press the knob to mute. Item Type: USB Volume Control Knob Support: For Android systems How to Use: Insert the USB cable, RGB lights will turn on. Press the knob for 2 seconds to turn off the lights, press again for 2 seconds to turn on the light. Note: Customization is not supported. Color: Black Material: Acrylic + Aluminum Alloy Package Contents: 1 x Volume Controller 1 x Type-C Cable 1 x 2.4G Receiver 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.