Feature: High-quality materials housing, matte anti-fingerprint finish, one-button non-slip rotary knob for comfortable touch and improved scratch resistance compared to standard plastic covers USB plug and play. 360-degree rotatable arc button for easy operation (volume adjustment, mute, track up/down, pause), designed with smooth edges to avoid discomfort Non-slip base with soft pad on the bottom ensures stability and prevents slipping during use Lossless sound quality. Adjust o directly from the source without compromising o performance. Suitable for desktop or laptop use Wide compatibility. Supports Windows 7/8/10/XP, Vista, Android, and iOS (iOS devices may require a compatible USB adapter) Specification: Name: USB volume controller Installation: USB driver-free setup Mode: Button-switchable dual mode Applicable to: Windows and macOS systems Note: If your device supports USB mouse and keyboard functionality, this volume controller will be compatible Material: Plastic Color: Black Package Contents: 1 x PC computer speaker volume control knob Package includes only the items listed above; other accessories are not included Note: Lighting effects and display differences may cause slight variations in color between the image and the actual product. Measurement tolerance: +/- 1-3 cm