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HTQ1021: 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.