Even in the world of ever-shrinking gadgets, small doesn't always mean better. Especially where ergonomics are concerned.
Brando's wireless mini-mouse measures less than 2.7 inches long and would be absolutely tiny to the average person as indicated by this photo, unless Andre the Giant was moonlighting as the hand model. It's definitely portable, as GeekAlerts says, weighing barely an ounce and easily carried in a pocket.
In fact, it might be too portable--we'd be afraid of losing it among the loose change. The real problem, however, is one of functionality: There's no way we could comfortably use a mouse this small. But maybe that's just a reflection of our.