Features: Brand new and high quality Aluminum metal casing. Aluminum alloy matte anti-fingerprint, one-button non-slip rotating knob, more comfortable to touch and scratch-resistant than plastic covers. USB plug and play. 360-degree rotatable arc button, easy to use (volume adjustment, mute, up and down, pause) and avoids discomfort caused by sharp edges. Non-slip mat. A soft pad at the bottom ensures stability and prevents slipping during use. Lossless sound quality. Adjust the audio source directly without affecting sound quality. Comes with a USB cable approximately 1.87m long, suitable for use with desktop or laptop computers. Wide compatibility. Supports operating systems for WIN 7/8/10/XP, for VISTA, for Android, for iOS (mobile phones require a suitable universal serial bus adapter cable). Specifications: Name: USB Volume Control Color: Black Material: Aluminum Alloy Installation Method: USB driver-free Size: Approx. 61x61x28mm/2.4x2.4x1.1in Line Length: 1.87m/7.2ft Mode: Button to switch dual mode Applicable to: for Windows Note: If your device can use a USB mouse and keyboard, you can also use our USB volume controllers. Due to different monitor and light effects, the actual color of the item may differ slightly from the color shown in the pictures. Thank you! Please allow 1-2 cm measurement deviation due to manual measurement. Package includes: 1 x Volume Adjuster 1 x USB Cable