USB Computer Volume Controller Multimedia PC Speaker External Audio Volume Control Adjust Knob Black Feature: Aluminum metal housing. Aluminum alloy 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 qualityComes with a USB cable approximately 1.87m/7.2ft long, suitable for use with desktop or laptopBroad compatibility. Support operating system for WIN 7/8/10/XP, for A pple, for VISTA, for Android, for i OS (mobile phone needs a suitable universal serial bus adapter cable) Specification: Name: USB volume controller Colour: Black Material: aluminum alloy Installation method: USB driver-free Size: 61x61x28mm/2.4x2.4x1.1in Weight: 88g Line length: 1.87m/7.2ft Packing size: 128x100x35mm/5.04x3.94x1.38in Mode: button to switch dual mode Applicable to: for Windows, for Mac OS Note:If your device can use a USB mouse and keyboard, you can also use our USB volume controls. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank youPlease allow 1-2cm measuring deviation due to manual measurement. Package included:1x volume adjuster1xUSB cable