Many of us are very heavy computer users ... The moveable sections are attached to the mouse core via a pair of ball joints connected with extendible arms, allowing the surfaces to be adjusted ...

Inside the ball there’s an Adafruit Feather ... space before sending its position to the computer. To send the click events, [Jacek] baked some mouse buttons into the keyboard’s firmware.

Kensington’s design shows a wireless trackball mouse with a large ball in the center that you can move to manipulate an on-screen cursor, a rotating ring surrounding the ball that functions as a ...