Feature:1. Strong Construction:Made of metal shell and with rotary shaft, equipped with breathing light and coming with USB cable.2. Wide Range of Volume: The volunme can be adjusted from 1 db to 100 db up to your choice, without any sound attenuation.3. Long Life Span: Rotary shaft supports 360°infinite rotation, more durable and great for long-time usage.4. Simple Operation: No need to install any driver or software on your computer to drive this volume regulator, it will work once you plugging on the device.When rotating or pressing the volume knob, the breating light under it will light on.5. One Key Mute Function: With one key mute function, when you are listening to music, just press the knob, it will stop at once and back to music when you press again.Specification:This USB volume adjuster can directly control the computer operating system volume. It is a great volume control tool for watching videos, playing games, even will be the best volume controller for wedding, meeting, celebration and so on. Features:Strong ConstructionMade of metal shell and with rotary shaft, equipped with breathing light and coming with USB cable.Wide Range of VolumeThe volume can be adjusted from 1 db to 100 db up to your choice, without any sound attenuation.Long Life Span Rotary shaft supports 360°infinite rotation, more durable and great for long-time usage.Simple OperationNo need to install any driver or software on your computer to drive this volume regulator, it will work once you plugging on the device.When rotating or pressing the volume knob, the breathing light under it will light on.One Key Mute FunctionWith one key mute function, when you are listening to music, just press the knob, it will stop at once and back to music when you press again. Specification:Comatibility: for Windows XP/7/8/10/, for Mac/Linux/Vista/AndroidMaterial of the shell: Aluminum Cable Length: 2m / 6.56ft Item Size: 6.2 * 4.8 * 3.9cm / 2.44 * 1.89 * 1.54inItem Weight: 107g / 3.77ozPackage Size: 11.7 * 9 * 4cm / 4.61 * 3.54 * 1.57in (L * W * H)Package Weight: 153g / 5.4ozPackage list:1 * USB Volume Control1 * USB Cable1 * User Manual(English)Package List:1 * USB Volume Control1 * USB Cable1 * User Manual(English)