WIDE APPLICATION: USB volume control knob is compatible with multiple systems, supports compatible withAndroid and Windows systems, and is compatible with mobile phones, tablets, laptops, and desktop computers. FUNCTIONS AND USES: USB volume controller can directly control the volume of the computer operating system, can be customized, support shortcut keys.( Note: Custom functions require editing software, compatible withediting software.) Bluetooth + wired version: The USB volume controller supports wired connection, Type-C interface, plug and play. It also supports Bluetooth connection. When connecting to Bluetooth, the main device must have Bluetooth function, such as computers and mobile phones. EASY TO USE: There is no need to install any drivers or software on your computer to drive this volume regulator, and can be used after plugging in the device. Custom knob, the knob can be defined as any key on the keyboard, or as volume up and down, previous song, next song, play and pause, mouse wheel, etc. Item Type: USB Volume Control Knob Features: Custom; Support shortcut keys Support: compatible withAndroid systems, Windows systems How to Use: 1. Rotate left: Volume down 2. Rotate right: Volume up 3. Press the knob: Pause/play 4. Press the knob and rotate left: Previous song 5. Press the knob and rotate right: Next song Color: Black Material: ABS+acrylic Package Contents: 1 * USB Volume Controller 1 * data Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.