Digital postal scale weighs envelopes and packages up to 5 lb. (2.2 kg) - without a trip to the Post Office or mailroom. Compact size fits on any desk 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 5-29/32" x 5-29/32" 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. Automatic shutoff deactivates the scale when scale is not in use to conserve battery power. The M5 Postal Scale operates on three AAA batteries (included).