Optical mice supplanted roller-ball mice. So what happens when an upside-down optical mouse sensor is put in a mobile phone? Stephen Shankland worked at CNET from 1998 to 2024 and wrote about ...

The Jelfin Mouse is a desktop blob, a ball-shaped mouse with a soft gel covering. It is also “designed to fit your hand perfectly”, and “the World’s first ball-shaped computer mouse covered in gel”*.