https://wifidb.science/wiki/Through_Wall_Cat_Flap
https://algowiki.win/wiki/Post:Doors_With_Cat_Flap
A cat flap is a small door that allows your pet to enter and leave the home as they like. It can be incorporated into windows, doors and even walls. It opens when a cat pushes through a part of its body. Microchip cat flaps unlock the door by acknowledging your cat's unique chip. Infrared and magnet cat flaps require your cat to wear a collar with an infrared or magnet device that activates them. What is a flap for a cat? A cat flap is an opening inside an opening or window that a
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