The Turbo Mouse has already won more awards than any input device in history. That's because of Kensington's commitment to combining the best hardware with the most up-to-date software features. Now, by matching the customizable software with a new 4-button design, the best just got better. This design allows you to get more fingers in on the action. And its flexible, symmetrical trackball design fits any size hand. The trackball designed specifically for Mac users gives you maximum control with minimum effort.