Use code (Case sensitive, Exp: 03/12 or while supplies last): USP1M26573
-Mini USB dongle fits in the mouse for easy travel use.
-Back key & shift key on mouse.
-1000 dpi optical sensor for smooth and precise tracking.
-Easy tracking on carpet, wood and some other difficult surfaces
-Uses 1 AA battery which lasts for 3 months.
-On/off switch for saving energy
