Logitech 930495-0403 Blue 3 Buttons 1 x Wheel USB or PS/2 Wired Optical Wheel Mouse

Here's a mouse that fits comfortably in either hand and delivers 800-dpi optical precision that's twice as fast and accurate as standard optical mice. It glides across almost any surface without a ball or other moving parts, letting you decide where and how you work. And the scroll wheel makes navigating documents easier and even doubles as a third button.