<br><br> Feature: High-quality materialsl housing. matte anti-fingerprint, one-button non-slip rotary button, more comfortable touch and scratch resistance than plastic cover<br>USB plug and play. 360-degree rotatable arc button, easy to use (volume adjustment, mute, up and down, pause), and avoid discomfort caused by sharp edges<br>Non-slip mat. There is a soft pad at the bottom, which is stable and non-slip during use<br>Lossless sound quality. Adjust the audio source directly without affecting the audio quality.suitable for use with desktop or laptop<br>Broad 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)<br><br>Specification: <br>Name: USB volume controller<br>Installation : USB driver-free<br>Mode: button to switch dual mode<br>Applicable to: for Windows, for OS<br>Note: <br>If your device can use a USB mouse and keyboard, you can also use our USB volume controls.<br>Material: plastic<br>colour: Black<br><br>Package Contents: <br>1 x PC Computer Speaker Volume Controller Knob<br><br>Only the above package content, other products are not included.<br>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.