Simple installation steps: it can be done on wooden or PVC doors. Adapters required for brick walls, glass and patio doors Adapts to various climatic conditions: thanks to its weatherproof band and its improved automatic double locking function, wind or heat stay out Give your dog or cat greater freedom: this allows you to provide maximum freedom for your dog or cat; it’s an ideal solution for letting cats and dogs into your home without having to open the door frequently. Your pet will be more independent Simple and practical locking: in addition to being easy to install, this door also allows you to offer maximum freedom to your dog or cat. Resistance: This pet door is sturdy and durable, thanks to its hard transparent plastic blade and high quality durable plastic frame; the door is suitable for most standard walls and doors There are four modes (1) Close the cat flap lock in both directions. (2) means the door opens both ways. (3) Allow cats out, but don’t let cats in. (4) L entry