Digital USB postal scale weighs envelopes and packages up to 25 lb. (11.34 kg) - without a trip to the Post Office or mailroom. Scale connects via USB cable (included) to PC or Mac to use scale with popular online mailing and shipping software - including Endicia InstaRate and DYMO Stamps software. Compact size fits in busiest work space and stores in most desk drawers. LCD screen displays weight in accurate, easy-to-read digital format - in lb./oz. (0 lb 00.0 oz) or kg/g (0 kg 000g). Conveniences include a hold feature, tare function and an automatic shutoff that prolongs battery life. Hold feature locks the weight display for 10 seconds after item is removed from the 8" x 8" weighing platform. This feature is especially useful when a larger package or envelope blocks the display. Tare function weighs items in a container minus the weight of the container. The M25 Digital USB Postal Scale runs on USB power from your computer or three AAA batteries (not included).