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 functions. Smooth edges designed to avoid discomfort from sharp corners. Equipped with a non-slip soft pad on the bottom for stability during use. Delivers lossless sound quality by adjusting the audio source directly without degrading audio performance. Ideal for desktop or laptop setups. Wide compatibility: supports Windows 7/8/10/XP, Vista, macOS, Android, and iOS devices (mobile phones may require a compatible USB adapter cable). Specifications: Name: USB Volume Controller Installation: USB driver-free setup Mode: Button-switchable dual mode Compatible with: Windows, Mac OS Note: If your device supports a USB mouse or keyboard, it will support this USB volume controller. Material: Plastic Color: Black Package Contents: 1 x PC Computer Speaker Volume Controller Knob Note: Light reflection and display differences may cause slight color variations between the image and the actual item. Measurement error allowed within +/- 1-3 cm.