At just 14 ounces, the oqo ultra personal computer (upc) is a fully-functional windows PC small enough to fit in your pocket, yet powerful enough to replace your laptop. Click here to see a video presentation of the oqo (you will need quicktime to view it). Click here for the model 01 with free extra battery and charger adapter. Please note - this unit comes complete with microsoft windows XP professional edition and has upgraded wifi performance when compared with older units.