PX-2SGR Size: Large (85" H x 5" W x 22" D) Features: -Panel.-Operates for months on a single lithium battery.-Ultrasonic operation will not interfere with or be affected by other electronic devices.-Just wandering by or sleeping next to the door.-Dual range controls let you set independent inside and outside activation distances.-4-Way access control lets you select from in only, out only, full access or closed and locked.-Optional, auto-recharging battery back-up protects against power outages.-Requires optional battery.-Battery only (Requires optional charger kit).-Automatic deadbolt lock, safety retract system. Includes: -Standard AC wall adapter (included). Options: -Available in Medium and Large sizes. Specifications: -3 Power modes. Dimensions: -Medium dimensions: 85" H x 4.5" W x 17.5" D.-Large dimensions: 85" H x 5" W x 22" D.