Ergonomically designed for optimum comfort, the Microsoft IntelliMouse TrackBall gives your wrist a rest by putting precise cursor control at your fingertips. Two standard mouse buttons on the left side allow easy thumb access, and a navigation wheel on the right side allows you to scroll through documents and Web sites with ease. The TrackBall comes with IntelliPoint 2.1 software for customizing navigation wheel functions and connects directly to a PS/2 or serial port. Sorry, Mac users: The IntelliMouse only works with PCs running Windows 3.1, 95 or NT.
Microsoft Intellimouse Trackball