The microchip cat flap from PetSafe has been designed to allow your cat an easy access to the outside world, whilst keeping stray cats and other animals out of your house. This cat flap functions by reading your cat\'s unique microchip ID without the need for a collar or other accessory. It is easy to install and really easy to programme. The pet gate is suitable for cats of up to 8 kg. This energy-efficient cat door is easy to install onto windows, walls and doors made of wood, PVC, metal, glass and brick.