https://nerdgaming.science/wik....i/Cat_Flap_Double_Gl
A cat flap is an opening that allows your pet to go in and out of the house whenever they want. It can be put in doors, windows and even walls. It can be opened by pushing a part of their body through it. Microchip cat flaps let you open the door by the chip of your cat's. Infrared and magnet cat flaps require your cat to wear a collar equipped with either a magnet or an infrared device that will activate the flaps. What is a flap for a cat? A cat flap is an opening inside an opening or window that allows your pet to go in and out