Sturdy construction: made of metal housing and ALPS rotating shaft, equipped with breathing light and USB data cable. With one-button mute function, when listening to music, just press the knob once, and press it again to stop playing the music immediately. This volume control knob supports for Win10/8/7/Vista/XP, plug it into a computer and start working; with an OTG cable, it can also be used for mobile phones. A great volume for watching videos, playing games, and even the best volume controller for events, weddings, meetings, celebrations and more. Simple operation: turn the knob to increase or decrease the volume, press the knob to mute, and press the knob to turn it to adjust the volume faster; press and hold the knob for 8s to enter night mode, and the breathing light is on. Easy to use: plug into the computer and use it; if used with an OTG cable, the mobile phone can also be used; knob control: one-key mute function - just press the knob and press it again to stop playing music immediately. Support for Win10/8/7/Vista/XP; Application: Watch videos, play games, even the best volume controller for events, weddings, celebrations, conferences, performances, etc.; safe to use because the controller does not have Connect the audio cable, easy to drop and make noise. Advantages: Compared with the potentiometer volume adjuster with 3.5mm AUX cable in series, there is no need to install any driver or software on the PC to drive the volume adjuster, it can work as soon as the device is plugged in; the USB volume adjuster directly adjusts your volume without distortion and noise. There is a built-in breathing light under the volume knob; in default mode, the breathing light light up every time the knob is pressed. Product name: USB computer volume adjuster Installation method: USBdriver-free Compatibility: for XP/7/8/10/, for Linux/Vista/Android Colour:Black Material:Aluminum Alloy Package Contents: 1x Volume adjuster 1x USB 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.