USB Volume Control Lossless PC Computer Speaker Volume Controller Knob Adjuster Digital Control with Walkbee High-quality materials housing, matte anti-fingerprint finish, one-button non-slip rotary knob for comfortable touch and scratch resistance USB plug and play, no driver required, 360-degree rotatable arc button for easy volume adjustment, mute, track up and down, pause functions Soft non-slip pad on the bottom ensures stability and prevents slipping during use Maintains lossless sound quality by directly adjusting the o source without affecting o performance Compatible with desktop and laptop computers Wide compatibility with Windows 7/8/10/XP, Vista, Android, and iOS devices (mobile phones require a compatible USB adapter cable) Name: USB Volume Controller Installation: USB driver-free operation Mode: Button switch dual mode Applicable systems: Windows, macOS Note: If your device supports USB mouse and keyboard, it can also use this USB volume controller Material: Plastic Color: Black Package Contents: 1 x PC Computer Speaker Volume Controller Knob Note: Light reflection and display differences may cause slight color variation between image and actual item Measurement error allowed within +/- 1-3 cm