1AUTO CLOSING WINDOW: Cat Interior door is transparent and has the function of auto closing window, which can close by itself after the pet leaves, convenient and safe. 2BARRIER FREE DOOR: You put the cat food in the house, the cat can come back home to eat and drink after free to go out to play and refuse the dog to come in. 3SAFETY: Cat door is made of ABS material, wear resistant and durable, with flat edges and no burrs to defend cats from scratching. Install in garages to defend homeless pets on cold nights. 4EASY TO INSTALL: Transparent cat door uses screws to install, avoiding peeling and gap caused by tape installation, no noise and trouble caused by door damage. 5APPLICABLE OBJECTS: Pet door fits all standard interior doors, suitable for any solid or hollow interior doors although most cat holes are not suitable for hollow doors.1 x Cat Door1 x Instruction Manual4 x Screws8 x Screw Hole Cap