Closer Pets Electromagnetic Wood Fitting Cat DoorCloser Pets Electromagnetic Wood Fitting Cat Door Stray pets can often be a big problem, but this highly proven design provides a reliable solution. Your cat wears a small magnet that doubles as an identification tag. A sensitive, fast reacting circuit in the cat flap guarantees instant entry for selected cats of all size and temperament. An easy to use 4 way locking system enables complete control over your cats movements. Key Benefits: Self lining