The compact, accurate DYMO M25 Digital USB Postal Scale weighs envelopes and packages up to 25 lbs (11 kg). Plus it connects via USB to your PC or Mac® so you can use it with popular mailing and shipping software, including Endicia InstaRate and DYMO Stamps. This scale is packed with great features - including a LED illuminated "hold" feature that locks the weight display for 10 seconds when the screen is obscured by a larger item, a tare function for accurately weighing items in a container and an automatic shut-off that prolongs battery life. Powered by USB cable (included) or 3 AAA batteries (not included)