The Dymo SKILCRAFT M25 Digital Postal Scale weighs envelopes and packages up to 25 lbs. Features an easy-to-read digital display, Tare function, Hold feature and Automatic shut-off to conserve battery power. The M25 scales connects via USB to your PC or Mac for use with popular mailing and shipping software. Powered by USB cable (included) or 3 AAA batteries (sold separately) Limited 1 Year Warranty