Feature: good quality materialsl housing. matte anti-fingerprint, one-button non-slip rotary button, more comfortable touch and scratch resistance than plastic coverUSB plug and play. 360-degree rotatable arc button, easy to use (volume adjustment, mute, up and down, pause), and avoid discomfort caused by sharp edgesNon-slip mat. There is a soft pad at the bottom, which is stable and non-slip during useLossless sound quality. Adjust the audio source directly without affecting the audio quality.suitable for use with desktop or laptopBroad compatibility. Support for WIN 7/8/10/XP, for , for VISTA, for Android, for iOS (mobile phone needs a suitable universal serial bus adapter cable)Specification: Name: USB volume controllerInstallation : USB driver-freeMode: button to switch dual modeApplicable to: for Windows, for OSNote: If your device can use a USB mouse and keyboard, you can also use our USB volume controls.Material: plasticcolour: BlackPackage Contents: 1 x PC Computer Speaker Volume Controller KnobOnly 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.