Simple installation steps: can be performed on wooden or PVC doors. Adapters needed for brick walls, glass and patio doors Adapts to different climatic conditions: thanks to its weatherproof strip and the best automatic double closing function, the wind or heat stays outside Give your dog or cat more freedom : this allows you to offer maximum freedom to your dog or cat; it is an ideal solution to let cats and dogs into the house without having to open the door frequently. Your pet will be more independent Simple and practical closure: in addition to being easy to install, this door also allows you to offer maximum freedom to your dog or cat. Durability: This cat flap is sturdy and durable, thanks to the clear hard plastic blade and high quality durable plastic frame; the door fits most standard walls and doors There are four modes (1) Close the cat flap lock in both directions. (2) means that the door opens in both directions. (3) Allow cats to go out, but don’t let them in. (4) Entry