Features:
1. This external volume control knob specially designed for computer is compatible for Win 10/8/7,for Vista, for XP, for Mac system.
2. USB connection, plug and play, after plugging into the computer, you can easily and quickly adjust the computer volume by rotating the knob.
3. Support one-key mute function, just press the knob to enter the mute state immediately, press it again to restore the sound, it is very simple and convenient to use.
4. Supplied with a USB cable about 2m/6.6 feet long, suitable for use with desktop or notebook computer.
5. Metal case with non-slip pads at the keys, sturdy and durable; a great computer volume control knob for watching videos, playing games, etc.
6. After-sale Service: If you have any questions, please contact us immediately and we will help you solve it as soon as possible.
Specifications: 
Interface: Micro USB
Texture of material: All alloy
Product Name: Volume controller
Scope of Application: All computers on Windows, for Mac.

Package List:
1 * Volume Controller 
1 * Cable