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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 cover 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 Non-slip mat. There is a soft pad at the bottom, which is stable and non-slip during use Lossless sound quality. Adjust the audio source directly without affecting the audio quality Comes with a USB cable approximately 1.87m/7.2ft long, suitable for use with desktop or laptop Broad compatibility. Support operating system for WIN 7/8/10/XP, for Apple, for VISTA, for Android, for iOS (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 you! Please allow 1-2cm measuring deviation due to manual measurement. Packages: 1x volume adjuster 1xUSB cable