WIDE APPLICATION: USB volume control knob compatible with multiple systems, supports Android, mobile phones, tablets, laptops, and desktop computers. FUNCTIONS AND USES: USB volume controller allows direct volume control on computers, supports customizable functions and shortcut keys. Customization requires editing software (available upon request). 2.4G + Bluetooth + Wired Version: Three-mode connectivity supports wired, Bluetooth, and 2.4G wireless connections. Bluetooth connection requires a Bluetooth-enabled device. 2.4G receiver pairs automatically upon insertion. Built-in large-capacity lithium battery with charging capability. EASY TO USE: No drivers or additional software required. Plug-and-play functionality. Customizable Knob: Knob can be programmed to act as volume up/down, play/pause, next/previous track, mouse wheel, or any custom keyboard key. Item Type: USB Volume Control Knob Features: Customizable, supports shortcut keys Compatibility: Android systems, mobile devices, laptops, desktops 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 song 5. Press and rotate right: Next song Color: Black Material: ABS + Acrylic Package Contents: 1 x USB Volume Controller 1 x Data Cable 1 x 2.4G Receiver Note: Light reflection and display differences may cause slight color variation between image and actual item. Measurement error allowed within +/- 1-3 cm.