Description <br> Default volume control function, clockwise to reduce the volume, counterclockwise to increase the volume, press the knob to mute. <br> Compatible with a variety of system devices, suitable for mobile phones, tablets, notebooks, desktop computers, compatible with Windoens and Andriod systems. <br> Type-C interface, plug and play. <br> RGB lighting effect, can be turned off. <br> The software can customize the button function: with the key value editing software, different button functions can be customized. <br> <br> Instructions for use: Insert the USB cable, the RGB light turns on, press the knob for 2 seconds to turn off the light, and press the knob for 2 seconds to turn on the light. Default volume control function, clockwise to reduce the volume, counterclockwise to increase the volume, press to mute. <br> Colour:Black <br> Material:Acrylic + Aluminum Alloy <br> <br> Package Contents: <br> 1 x USB Volume Controller <br> 1 x Type-C Cable <br> <br> Only the above package content, other products are not included. <br> 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. <br>