He previously modded his old wired mouse to have a rapid fire button using a 555 timer. That worked fine as the mouse ran off the USB’s 5 volts, and that’s the voltage the 555 timer needed.

So, if you middle-click and move your mouse up, down, left or right significantly, it might scroll through multiple pages quickly. On Windows, you can use the middle-click button to close app ...

Early prototypes of the mouse featured a rectangular wooden shell with two metal wheels inside – one for the X axis and one for the Y axis. The device had just one button, located in the top corner.