Digital USB shipping scale weighs envelopes and packages up to 100 lb. (45 kg). Built-in, wraparound handle allows easy portability so you can carry the scale to heavy packages, not vice-versa. Detachable LCD screen allows convenient handheld or wall-mounted viewing and displays weight in accurate, easy-to-read digital format - in lb./oz. (0 lb 00.0 oz) or kg/g (0 kg 000g). Scale connects via USB cable (included) to PC or Mac to use the scale with popular online mailing and shipping software. Conveniences include a hold feature, tare function that weighs items minus the weight of the container, and automatic shutoff that prolongs battery life. Hold feature locks the weight display for 10 seconds after item is removed from the 12" x 12" weighing platform. This feature is especially useful when a larger package or envelope blocks the display. The S100 Digital USB Shipping Scale is powered by USB cable (included), AC adapter (included) or three AAA batteries (not included).