Kensington Orbit Trackball Mouse
Compared to all other trackballs, this one is Star Trek looking, but not so good. No scroll wheel. 2 buttons only.
though, someone used this trackball to play the game osu well!
for osu game, see Test Your Mousing Efficiency!
The following are all better.
If you have a question, put $5 at patreon and message me.