WIDE APPLICATION: USB volume control knob is compatible with multiple operating systems, including Windows, macOS, and Android. It works with mobile phones, tablets, laptops, and desktop computers. FUNCTIONS AND USES: USB volume controller allows direct volume adjustment on connected devices. Supports customizable functions and shortcut key assignments. Bluetooth + Wired Version: Supports both wired connection via USB-C interface (plug-and-play) and Bluetooth connectivity. Bluetooth pairing requires a Bluetooth-enabled host device such as a computer or smartphone. EASY TO USE: No drivers or additional software required. Simply plug in to use. CUSTOMIZABLE KNOB: The knob can be programmed to function as volume up/down, play/pause, previous/next track, mouse wheel scroll, or any standard keyboard key. Item Type: USB Volume Control Knob Features: Customizable; Supports shortcut keys Compatibility: Windows, macOS, Android How to Use: 1. Rotate left: Volume down 2. Rotate right: Volume up 3. Press the knob: Play/Pause 4. Press and rotate left: Previous track 5. Press and rotate right: Next track Color: Black Material: ABS + Acrylic Package Contents: 1 × USB Volume Controller 1 × USB-C Data Cable Note: Color appearance may vary slightly due to screen settings and lighting conditions. Measurement tolerance: ±1–3 cm.