Wonderful use experience: turn the multimedia knob to adjust the volume. With one-key mute function, when you listen to music, just press the knob, the music will stop, if you press the knob again to start playing.Rugged and Durable: The USB volume control knob is made of high-quality metal housing with a sturdy rotating shaft and a detachable USB cable, which makes this audio adjuster durable.No Drivers: This volume control knob supports Windows xp/7/8/10/MAC OS, once you plug it into your computer, it will start working. Plug and play, no driver required, you can directly adjust the volume by turning the knob.Delicate and Convenient: Easy to carry and use due to its mini delicate design. Combined with aluminum alloy and black exterior, the whole USB volume control knob looks more atmospheric and stylish.Material:Metalcolour:BlackPackage Contents:1 x USB volume controller 1 x USB power cord 1 x English manualOnly the above package content, other products are not included.Note: Light shooting 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.