Comfort Sleek shape: Delivers all-day comfort for either hand.
Precision Optical Marble® technology: Tracks smoothly and precisely.
Control Large trackball: Improves control while reducing hand and wrist motion. Multiple scrolling options: Use forward and back buttons, or auto-scroll with the ball. Customizable buttons: Personalize your controls for productivity (with included Mouse Ware software).
System Requirements PC Windows® 95, Windows® 98, Windows NT®, Windows® 2000, Windows® Me, Windows® XP, Windows Vista™ USB or PS/2 port (Windows® 98 or later for USB) CD-ROM drive
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