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. Broad compatibility with Windows 7/8/10/XP, Vista, Android, and iOS devices. iOS and mobile devices may require a compatible USB adapter cable. Specifications: Name: USB Volume Controller Installation: USB driver-free setup Mode: Button-switch dual mode Compatible with: Windows and macOS systems Note: If your device supports USB mouse and keyboard functionality, it can use this USB volume controller. Material: Plastic Color: Black Package Contents: 1 x PC Computer Speaker Volume Controller Knob Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.