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Description:Features: 1) Humanist wide idler wheel design, comfortable to hold, agile to operate 2) Sensitive reactions of the keystroke switch, long lifespan 3) Latest optical induction technology adopted, make orientation more precise 4) Convenient to keep, no need of mouse pad to clear or maintain 5) Free zooming and easily controlled windows, easy to use with different interfaces 6) Fully compatible with Windows95 / 98 / 2000 / ME / XP Packing: window box, color box