High-quality materials housing with matte anti-fingerprint finish. Features a one-button non-slip rotary knob for comfortable touch and improved scratch resistance compared to standard plastic covers. USB plug and play functionality. 360-degree rotatable arc button allows easy control of volume adjustment, mute, track navigation, and pause. Smooth edges designed to avoid discomfort from sharp corners. Equipped with a non-slip soft pad on the bottom for stable and secure placement during use. Delivers lossless sound quality by directly adjusting the o source without compromising o performance. Ideal for use with desktop or laptop computers. Wide compatibility with Windows 7/8/10/XP, Vista, Android, and iOS devices. Note: iOS and certain mobile devices may require a compatible USB adapter cable. Compatible with any device that supports standard USB mouse and keyboard functions. Specifications: Name: USB Volume Controller Installation: USB driver-free setup Mode: Button-switch dual mode Compatibility: Windows and macOS Material: Plastic Color: Black Package Contents: 1 x USB Volume Control Knob Note: The package includes only the items listed above. Other accessories are not included. Due to lighting effects and monitor settings, the actual color of the product may vary slightly from images. Measurement tolerance: +/- 1-3 cm.