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) Name: USB volume controller Installation method: USB driver-free Line length: 1.87m/7.2ft Mode: button to switch dual mode Applicable to: for Windows, for Mac OS Material: Plastic + Metal colour: black Package Contents: 1 x USB volume controller Only 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.