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 up/down, and pause functions, designed without sharp edges to prevent discomfort. Equipped with a non-slip soft pad on the bottom for stability during use. Delivers lossless sound quality by directly adjusting the o source without compromising o performance. Suitable for use with desktop or laptop computers. Wide compatibility: supports Windows 7/8/10/XP, Vista, Android, and iOS devices (iOS devices may require a compatible USB adapter cable). Specifications: Name: USB Volume Controller Installation: USB driver-free setup Mode: Button-switch dual mode operation Compatibility: Works with Windows and macOS systems Note: If your device supports standard USB mouse and keyboard peripherals, it will support this USB volume controller. Material: Plastic Color: Black Package Contents: 1 x PC Computer Speaker Volume Controller Knob Note: The package includes only the items listed above. Other accessories are not included. Lighting and display differences may cause slight variations between the product color in images and the actual product. Measurement tolerance: +/- 1-3 cm.