Description: This USB volume control knob is made of high-quality aluminum alloy casing, with a sturdy rotating shaft and a detachable USB cable, which makes this audio regulator elegant and durable, giving you a good experience. Rotate the multimedia knob to adjust the volume, and with -key mute function, you can stop the music just by pressing the knob. If you press the knob again, you can start playing. SUPPORT Win10/8/7/, plug and play, no drive needed, three-level tuning mode can be selected to adjust the volume. Compact and portable, it is easy to carry and use. Combining its cool black appearance, the entire USB volume control knob looks more atmospheric and fashionable. Heavy metal blocks are placed in the base, and there are 4 anti-slip pads at the bottom, very stable. No worry about others would accidentally touching the tuning knob. Specification: Material: Aluminum Alloy Interface: USB Cable Length: 150cm/4.9ft Modes: 3 Modes (X2 X4 X10) Features: -key Mute, drive-free, Non-slip, plug and play Support Win10/8/7/ The lights are all red, if the button does not work, it is a compatibility problem Size Chart: 97x61x17mm/3.82x2.40x0.67inch Package Includes: 1 Piece Computer Volume Controller 1 Piece USB Cable Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!