The PetSafe Manual-Locking Cat Flap is an easy way to give your cat access while maintaining control. The adjustable 4-way lock lets you choose when and how your cat uses the cat flap. Whether you set the flap to fully locked or if you want the flap locked for unknown animals or cats. The cat flap comes with an impact-resistant plastic, which can withstand the most energetic pets. Double magnets hold the door in place and a pull cover around the door helps add insulation. Can be installed in most types of doors or walls, including wood, PVS, brick, metal and glass. When installing in thicker doors, walls, etc., tunnel extenders can be purchased. Facts about PetSafe Manual-Locking Cat Flap:Easy way to give your cat access. With 4 - weighted locks. Double magnets to hold the flap in place. Draught excluder around the flap for added insulation. For cats up to 7 kg. 3 year warranty.