https://world-news.wiki/wiki/U....sing_a_Cat_Flap_in_B
A cat flap is a door that allows your pet to enter and exit the house at their convenience. It can be incorporated into windows, doors and even walls. It can be opened by pushing through a section of its body. Microchip cat flaps recognise your cat's unique microchip and unlock the door. Infrared and magnet cat flaps require your cat to wear a collar equipped with a magnet or infrared device that will activate the flaps. What is a cat flap? A cat flap is a opening in an opening or window that allows your pet to get in and ou