Programmable scale calculates U.S.P.S. (1st Class, Priority & Express Mail) rates for multiple rate comparisons at the touch of a button. Reprogrammable memory chip allows you to update the scale with future U.S.P.S. rate changes. Replaceable memory chip (sold separately) is available for future U.S.P.S. rate changes at an additional cost. Compact size stores easily. 2 lb. capacity covers most letters & some small packages. Weight is displayed in grams or ounces. Readouts are displayed instantaneously for faster processing. Tare feature separates content weight from package or container weight. Auto shut-off extends battery life. Low battery condition indicated. Easy-to-read display shows dollar charge & class of service or weight. Count feature generates a piece count for bulk mailings or multiple pages of similar items. Adjustable stand prevents large envelopes from covering the display. Not legal for trade. Operates on an AC adapter or 9 volt battery.