The PetSafe Electronic Pet Door - Large unlocks for your big furry friend using a SmartKey collar system, granting hands-free access while keeping unwanted visitors out. Designed for pets up to 100 pounds, it features an energy-efficient insulated flap with UV sun protection. 
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SmartKey system: PetSafe SmartDoor SmartKeys worn on your pet's collar are read by the door to unlock.
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Programmable modes: 3 modes: Automatic, Locked and Unlocked to fit busy households or controlled access.
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Pet size compatibility: Suitable for pets up to 100 pounds.
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Flap opening size: 13-1/16" x 15-3/4" for comfortable passage.
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Power and battery: Uses 4 D-cell batteries (not included); low battery indicator keeps you informed.
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Energy efficiency: Insulated flap with UV sun protection reduces drafts and conserves energy.
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Door thickness compatibility: Fits door thickness 1-1/2" to 2".
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SmartKeys included: Includes one programmed SmartKey and battery.
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Additional SmartKeys: Up to five SmartKeys total can be programmed to grant access to multiple pets.
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Key programming: Easily program up to 5 SmartKeys with a button press.
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Included accessories: Owners Manual and Pet Door Sizing Chart included.
With its SmartKey-based access, you can grant permission to your pet while preventing entry by others. The three modes provide flexible automation—Automatic lets your pet pass through when detected, Locked keeps the door secure, and Unlocked offers temporary open access when needed. The insulated, UV-protected flap minimizes drafts and energy loss, and the low battery indicator helps you maintain smooth operation. For households with multiple pets, you can program up to five SmartKeys to manage access without juggling collars.