The robot in question is a skid-steer 4-wheeled toy, to which he has added an ADNS3080 mouse sensor fitted with a lens, an H-bridge motor driver board, and a Wemos D1 Mini single board computer.
Those sensors are finicky and a few problems during testing prompted him to look at a redundant system. Right now he’s experimenting with adding an optical mouse sensor to the autonomous vehicle.
In most new-release gaming mice, then, even in budget ones, you can expect the mouse’s sensor to have a more ... that fits your hand and your grip type; one that’s neither irksome or awkward ...