The PetSafe® SmartDoor™ allows you to control your pet’s access. When set to automatic mode, only your pets wearing the SmartKey™ can pass through the SmartDoor™. As your pet enters the range of the SmartDoor™, the SmartDoor™ detects the SmartKey™ and unlocks automatically. The range is adjustable up to 3 feet. After your pet passes through the SmartDoor™, the door will lock automatically helping to keep the house pets in and outdoor animals out. Trust PetSafe® to help keep your pet healthy, safe and happy.