Designed for door screens and window screens, allowing your cat or dog to come in and out, can be set to automatic, open or close, allowing you to give them maximum freedom. Made of high quality ABS material, screw reinforcement makes our pet door strong enough, smooth surface, dirt-resistant, wear-resistant, corrosion-resistant, non-deformable, anti-aging, can prevent damage. scratches and has a long service life. With the integrated magnetic flap, it can be closed automatically. When your pet leaves, the door closes automatically. You can even lock the door to keep your pet out at night or when youre not home. Nylon mesh material keeps bugs, flies, and the like out, filters dust and dirt in the room, provides better ventilation for your home, reduces the smell of pets. The frame has a smooth edge to prevent scratching pets. It is suitable for cats and small dogs (check your pets size before purchasing). Inner size (L x W x H) 21 x 1 x 26 cm, it is suitable for cats whose waist circumference is less than 40 cm. And the outer size is (L x W x H) 24 x 1 x 29 cm. It is suitable to be installed on interior doors, exterior doors, walls, windows, closets, glass, etc.