4 locking modes: open. farm. enter alone or exit alone. which allows your cat to come in and out as it pleases without you losing control of its comings and goings This Magnetic Pet Door is suitable for Windows. glass doors. brick walls. PVC doors. uPVC and metallic Easy to install - The nails and mats included in the set allow you to easily install it in windows. the doors. the cabinets. panels and walls. etc. Safe and well thought out - the transparent flap allows the pet to see through the door. The outer rain seal is waterproof. The brush strip eliminates noise when closing the door. The 4-way smart door control gives the cat more freedom. The inner edge of the frame is polished so as not to hurt the cat. With this cat door you can control the comings and goings of your pet and free up your time to open the door without worrying about your pet. At the same time your pet will like a big and free house