Postal Scale features a round platform and an easy-to-read four-digit LCD. It features 0.1 oz. increments, straight weigh scale, Auto-zero function upon start up and auto-shut off to preserve battery after 30 seconds of inactivity. Low battery indicator adds to the battery's life. It operates on one 9 volt alkaline battery (not included). This scale is intended for private use only - it is not legal for trade. It can operate on an optional 9V battery (not included).