PetSafe SmartDoor Dog Door Large White 16.125" x 23.625"
The SmartDoor can detect up to five programmed SmartKeys and also operates in two other modes: fully locked mode and unlocked mode. Locked mode does not allow entry or exit for any pet and unlocked mode allows entry and exit for all pets.
Features: 3 programmable modes: Automatic, Locked and Unlocked. Now includes one programmed SmartKey and battery. Easily program up to 5 SmartKeys with a touch of a button. Energy efficient, insulated flap with UV sun protection. Uses 4 D-cell batteries, not included. Low battery indicator. How to Prepare, Install, Set and Operate with helpful tips included in Operation Guide.