Tough Scales Scale with USB Connection, 10 lb Capacity (USB10) Large-capacity, highly accurate digital postal scale 10-lb capacity Powered by USB power from PC, 9V alkaline battery (not included), or optional AC adapter #AD9 Calculates postage in 0.1 oz increments Hinged raised platform allows weighing of large envelopes vertically, mailing tubes or other large items Clear extra-large LCD display