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Logitech's TrackMan® Marble trackball offers unmatched reliability, precision and performance in a comfortable design. Patented Marble® technology replaces mechanical motion recording with optical tracking to enhance precision, reduce wear and ensure smooth tracking. Resistant to dust and dirt, the thumb-controlled trackball doesn't require regular cleaning, and provides fast, precise cursor movement. Since it's a trackball, it doesn't take large arm movements to get cursor motion. Customize the three buttons for personalized performance, double-click, draglock or give other commands with a single button click. Or, assign a button to scroll easily in Windows® 95 and Microsoft® Office® 97, or on the web.
http://www.logitech.ch/
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