Evergreen Mouse: Micro USB Mouse
Personally I am too young mice appear quite uncomfortable, which usually takes many people with their laptops to save space, not finish them and get used to when I have to use and makes a go slower, but still there are people who want to further reduce size and Evergreen among them.
Evergreen has created a tiny mouse (30 x 20 x 30 mm) and about 22 grams of weight, its micro USB mouse. As we can see in the image the mouse has four parts (as if ounces chocolate) and has a small ball to move the pointer (much like the pearl of the BlackBerry).

It is only compatible with Windows XP and Vista so many users are out of power use.
Source
The Micro USB Mouse from Evergreen Japan