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A cat flap is an opening that allows your pet to leave and enter the house at their own pace. It can be installed in doors, windows, and even walls. It can be opened by pushing the body part through it. Microchip cat flaps can recognize the unique microchip of your cat to unlock the door. Infrared and magnet flaps require that your cat wear a collar equipped with an infrared or magnetic device to activate them. What is a flap for cats? A cat flap is an opening inside the form of a window or door that allows your pet to enter and exit the house