-Trackballs, well you may have seen that trackball mouse out there and you cant live without it. Well, I would reconsider this if I was you. The trackball on these get really oily just from your fingers quick. Also while doing this you are making the rollers slick thus making performance drop quickly and the need of cleaning more often. I am sure there are trackball mice out there that are better now, but I have never had luck with them. One of the good sides of this is that they take up little space.
-So what is the difference in a regular mouse and a trackball you ask? Virtually none, its really a mouse that is turn up side down. Instead of you rolling the mouse across a pad you will use your fingers instead. Hmm..
Mice/Rodents - Alternative Mice 
