Pets are free in and out: The screen door is equipped with magnets at the bottom, closes automatically. Two sliding latches at the bottom of the flap help you lock the dog door, keeping your pets home when you're not home. Easy Installation: The dog door is easy to install. You can install it yourself. The cat flap package includes screws and an installation manual. Size: inner frame (28cm x 33cm) outer frame (34cm x 44cm), select the appropriate height to install based on the size of your dog. Suitable for most small and large dogs, cats or other pets, but not suitable for very small pets, because the flap swings too heavy. Scope of application: pet door can only be installed over existing screen doors, hallways, windows or other screen windows. They cannot be used for very thick wooden and glass doors. If you have any questions during installation, please feel free to contact us. Material: The mosquito net door dog flap is made of ABS material, which is safe and non-toxic, harmless for your pets, smooth surface, wear-resistant, corrosion-resistant, easy to clean and has a long service life.