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When the SmartDoor Electronic Petsafe Pet Door is set to “Automatic Mode” only your pets wearing the SmartKey can pass through the SmartDoor. No other animals can come in. Uses radio frequency signal that does not need line-of-site to work. It’s the “next generationautomatic pet door. The SmartDoor allows you to control the access of your pets. And no other animals can pass through. As your pet enters the adjustable range of the Electronic SmartDoor The SmartKey transmits a signal so that the SmartDoor “detectsthe SmartKey and unlocks automatically – much like your car unlocks when you press the “openbutton on your transmitter. The range is adjustable up to 3 feet fast-moving pets need 3 feet slower pets can have a shorter range to be sure no other animals slip in with them After your pet passes through the Electronic SmartDoor the door will lock automatically. Radio Frequency key does not require line of sight direction. As long as your pet is in the range you have selected the door opens. Collar key works even if obstructed by dirt.