The DYMO M10 Digital Postal Scale weighs envelopes and packages up to 10 kg without a trip to the Post Office or mailroom. Connect via USB to your PC or Mac? to use with popular mailing/shipping software, including DYMO Stamps? . Conveniences include a hold feature that locks weight display for ten seconds, a tare function for accurately weighing items in a container, an automatic shut-off, and an LCD screen that displays the weight in easy-to-read digital format - in lbs/oz or kg/g. The unit can be powered by USB cable (included) or three AAA batteries (not included).