Wide Application: This USB volume control knob is compatible with multiple systems, including Android. It works with mobile phones, tablets, laptops, and desktop computers. Functions And Uses: The USB volume controller can directly control computer volume and supports shortcut keys. Custom functions require editing software; please contact customer service for the software. Three-Mode Connectivity: The model supports wired USB connection, Bluetooth connection, and 2.4G connection. For Bluetooth, the main device must have Bluetooth function. The 2.4G receiver connects one-to-one and pairs automatically for use. Built-in large capacity lithium battery with charging function. Easy To Use: There is no need to install any drivers or software on your computer. It can be used after plugging in the device. The custom knob can be defined as any key on the keyboard, or as volume up/down, previous song, next song, play/pause, and mouse wheel. Item Type: USB Volume Control Knob Features: Custom; Support shortcut keys Support: For Android systems How To Use: Rotate left: Volume down Rotate right: Volume up Press the knob: Pause/play Press the knob and rotate left: Previous song Press the knob and rotate right: Next song Color: Black Material: ABS and acrylic Package Contents: 1 x USB Volume Controller 1 x Data Cable 1 x 2.4G Receiver