Features   State-of-the art advanced laser    technology   Ergonomic Design, Comfortable    control   Optimal size to avoid fatigue after    long period use   Wheel for scrolling  &n... 

High Resolution 800 dpiCompatible with Microsoft     Windows 95/ 98/ ME/ 2000/     XP/ Vista  Optical Tracking Technology Ergonomic Design

  High Resolution 800 dpi  Compatible with Microsoft     Windows 95/ 98/ ME/ 2000/ XP/     Vista   Optical Tracking Technology  Ergonomic Design

High Resolution 800 dpiCompatible with Microsoft     Windows 95/ 98/ ME/ 2000/     XP/ Vista Optical Tracking Technology Ergonomic Design

FEATURES   Brand-new Ergonomic Design,    Comfortable hand touch   Scroll up and down directly without    moving your hand   Switch vertical to horizontal wheel   Accurate definition and sensitivity &nb...