This computer knob controller makes it convenient to control the computer, such as volume, screen brightness, image zooming, pen size, font size, video clips editing, etc.

Twisting is an operation that humans are born with. Door handles, faucets, gas, motorbike throttles are all operated by twisting. No matter how you twist, it is possible to control both speed and amplitude in one operation. However, when it comes to the computer, it is not possible to "twist" it. This is the reason why the controller was designed in the first place.