Description Features: Brand new and high quality Aluminum metal casing. Aluminum alloy matte anti-fingerprint, one-button non-slip rotating button, more comfortable for touch and scratch than plastic covers. 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 cushion on the bottom, which is stable and non-slip during use. Lossless sound quality. Adjust the audio source directly without affecting the sound quality. Comes with a USB cable of about 1.87m/7.2ft long, suitable for use with a desktop computer or laptop. Wide Compatibility. Supports operating systems for WIN 7/8/10/XP, for VISTA, for Android, for iOS (mobile devices need a suitable USB adapter cable). Package Contents: 1 x Volume Adjuster 1 x USB Cable Specifications: Name: USB Volume Control Color: Black Material: aluminum alloy Installation Method: USB driver-free Size: about 61x61x28mm/2.4x2.4x1.1 inches 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 controls. Due to the different monitor and light effect, the actual color of the item may be slightly different from the color shown in the pictures. Thank you Please allow 1-2 cm measurement deviation due to manual measurement.