Feature: 1. Wide compatibility, it is suitbale for Windows for Android for OS X systems, and more widely used. 2. The USB volume adjuster can directly control the volume of the computer operating system without a mouse and is convenient to use. 3. The shaft supports 360° unlimited rotation, which is more durable and can support long term use without frequent replacement. 4. There is no need to install any driver or software on your computer to drive this volume adjuster, you can use it after plugging in the device. 5. Free to adjust, easy to operate and convenient, it is the best volume control for watching TV, playing games, listening to music. Specification: Item Type: USB Volume Control Model: AM U001 Material: Aluminum Alloy Interface: Micro USB Cable Length: Approx. 1.5m / 5.0ft Compatible: For Windows XP 7 8 10 for Vista for Android4.5 Or Higher for OS X 8.6 Or Higher. Package List: 1 x Volume Controller1 x Data Line1 x Manual