1.Cat screen door: An independent pet door will make your life more convenient, giving your cat or small dog dom to come and go to the yard or balcony, without the need to open the door all day. 2.SelfClosing Lockable: Our dog screen door with builtin magnet can keep the door automatically closed when your dog leaves. You can lock the door to prevent your pets from going out at night or when you are not at home. 3.Easy to install: Just use a knife to cut the screen and a screwdriver to install the screws. Installing with two people is easier. The package includes screws and an installation manual. Screens are not included; you need to use the screen that was cut off before. Detailed installation instructions save installation time. 4. and sturdy: The door Frame is made of ABS plastic, durable, and won't deform even in strong summer sunlight. You can install this pet door on a screen door, window, or sliding door. It cannot be used for very thick wooden doors, iron/aluminum doors, or walls.