4 locking modes: open. close. in only or out only. which allows your cat to come and go as they please without you losing control of their comings and goings This Magnetic Pet Door is suitable for Windows, glass doors, brick walls, PVC, uPVC and metal doors Easy to install - The nails and mats included in the set allow you to easily install it in windows, doors, cabinets, panels and walls. etc. Safe and thoughtful - the transparent flap allows the pet to see through the door. The outer rain seal is waterproof. The brush strip eliminates the noise when closing the door. The 4-way intelligent door control gives the cat more freedom. The inner edge of the frame is polished to avoid hurting the cat. With this cat flap, you can control your pet's comings and goings and free your time to open the door without worrying about your pet. At the same time, your pet will like a large and free house