WIDE APPLICATION: USB volume control knob compatible with various system devices, suitable for mobile phones, tablets, and desktop computers, compatible with Android systems. Supports wired USB and wireless 2.4G dual mode, equipped with a rotary encoder. FUNCTIONS AND USES: USB volume controller allows direct control of computer volume. FLEXIBLE AND ROTATABLE: The spindle of the PC USB volume control knob supports 360° rotation, designed for durability and extended use. WITH LIGHT: USB volume controller knob features RGB lighting that can be switched on and off, Type-C interface, plug-and-play. EASY TO USE: No driver or software installation required. Simply plug in the device to use. Default volume control function: clockwise to decrease volume, counterclockwise to increase 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 turn on. Press and hold the knob for 2 seconds to turn off the lights, press and hold again for 2 seconds to turn on the lights. 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 is included; other products are not included. Note: Light reflection and different displays may cause slight color variations between the item in the picture and the actual product. Measurement error allowance is +/- 1-3 cm.