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A cat flap is an opening that allows your pet to go in and out of the house at their convenience. It can be installed in doors, windows, and even in walls. It can be opened by pushing an area of their body through it. Microchip cat flaps unlock the door by recognizing your cat's unique chip. Magnet and infrared cat flaps require your cat to wear a collar with either a magnet or an infrared device that will activate them. What is a cat's flap? A cat flap is an opening in a door or window which allows your pet to get in and out of t