Dimensions: Outer frame of the pet door: 24 cm x 29 cm, inner frame: 20.5 cm x 26 cm. Suitable for small and medium-sized pets. Material: Made of high quality ABS material, safe and non-toxic, durable. Pets can get in and out freely: There are magnets on the bottom sides of the door frame. After pets get in and out, the screen door will be closed automatically. There is no need to open the door for your pet open and close repeatedly to allow your pet freedom of entry and exit. The blue slide lock can lock the whole door, and you can also control pets in and out. Easy Installation: Suitable for any screened door and window. According to the height of the pet, install the door in a suitable position and fix it with screws. Instructions are included in the package, follow Just follow the instructions. Recommendations for use: During the bedding of the insides of the door, the insides of the door should bend slightly. When using the screen door for the first time, please guide the pets to use the door to get in and out.