Wonderful User Experience: Rotate the multimedia knob to adjust the volume. One-button mute function: When listening to music, simply press the button to pause; press again to resume playback. Robust and Durable: The USB volume control knob is made of a high-quality metal casing with a sturdy rotary shaft and a detachable USB cable, ensuring durability. No Drivers Needed: This volume control knob supports Windows XP/7/8/10/OS. It works immediately upon connection to your computer. Plug and play, no driver installation required. Adjust the volume by simply rotating the knob. Delicate and Convenient: Its mini, delicate design makes it easy to carry and use. The combination of aluminum alloy and black exterior gives the USB volume control knob a more atmospheric and stylish look. Material: Metal Color: Black Package Contents: 1 x USB Volume Control 1 x USB Cable 1 x English Manual Note: Light 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.