You may need this controller knob when you in below situation:

- Getting bored with mouse control

- Too busy to control the volume without third hand helps you out of trouble

- Old key board to control definitely troublesome

- Old computer, control the volume cost one year

Then try this usb volume knob and you will feel relaxed.



Please know:

Can not adjust volume of Application, like web player, Youtube, Clouds.

Only can adjust volume of system, like windows and mac system.

Please connect the controller to computer to ensure power and data steady.

Do Not support Linux system.

Do Not support Remote Control Desktop.

Do Not support VMWare Workstation.

Do Not support VM.