Features: USB computer volume controller multimedia computer speaker external audio volume control adjustment knob black Aluminum metal shell, aluminum alloy matte anti fingerprint, one click anti slip rotating button, more comfortable touch and scratch resistance than plastic cover USB plug and play. 360 degree rotatable curved button for easy use (volume adjustment, mute, up and down, pause), avoiding discomfort caused by sharp edges Lossless sound quality. Directly adjust the audio source without affecting audio quality specifications Anti slip pad. There is a soft pad at the bottom, which is stable and non slip during use Name: USB fader Color: Black Material: Aluminum alloy Installation method: USB driver free Size: 61x61x28mm/2.4x2.4x1.1 inches Line length: 1.87m/7.2ft Packaging size: 128x100x35mm/5.04x3.94x1.38in Mode: button for switching between dual modes Applicable to: for Windows, for Mac OS Packaging includes 1 * USB volume controller