The 5 lb scale features memory hold to lock in weight of large packages & oversized letters. Digital accuracy reduces risk of overpaying / underpaying postage. Hold feature is designed for weighing oversized packages that block the display. Includes high-impact plastic chassis, 5-7/8" x 5-7/8" platform, tare feature to weigh contents of a container. Weighs in both lb & kg. Auto shutoff preserves battery life. Scale operates on a 9 volt battery or AC adapter (not included).