Feature: High-quality material housing. matte anti-fingerprint, one-button non-slip rotating button, more comfortable touch and scratch resistance than plastic cover USB plug and play. 360-degree rotatable arc button, easy to operate (volume adjustment, mute, up and down, pause) and avoid the discomfort caused by compatible with sharp edges non-slip mat. There is a soft pad at the bottom, which is stable and non-slip during use Lossless sound quality. Adjust the sound source directly without affecting the sound quality. Suitable for use with desktop or laptop Wide 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 Control Installation: USB driver-free Mode: button to switch dual mode Applicable to: for Windows, for OS Note: If your device can use a USB mouse and keyboard, you can also use our USB volume controls. Material: plastic Color: Black Package Contents: 1 x PC Computer Speaker Volume Control Knob Only the above package contents, 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 +/- 1-3 cm.