Convenient Locking: The knob can be rotated in 4 directions. You can easily rotate it to 4 positions using the arrows and icons to control your cat's access options: in only, out only, free in and out, fully locked. ??Weatherproof Waterproof Brush Strip: It provides a retaining groove with a snap lock for weatherproof brush strips. Even if the brush bar comes loose, it is easy to put it back into the retaining groove. This helps the brush strips reduce noise and keep pests such as raindrops, wind or mosquitoes away. Screw Set: The delivery includes 2 packs of 8 screws each, one with short screws and one with long screws. Tighten them with both sides to avoid cracking, not just one side. Depending on the depth of the door/wall you are installing, you can use 8 screws for the long+long, long+short or short+short set of 4 screw holes. Easy to Install: installation instructions in the retail packaging and step-by-step installation instructions in the installation overview video. The depth of the tunnel can be reduced depending on the installation needs.> Suitable for installation on interior doors, exterior doors, walls, windows, cabinets, glass, etc. Make sure the pet's width and height (shoulder height) are less than the pet gate's door, the magnet on the bottom of the door frame is used to align the flap after it has been moved, it cannot be used as a lock. Packaging: 1* Pet Door Opening Outer dimensions (L x W x H): 19 x 22 x 5 cm Inner dimensions (L x W x H): 15 x 15.5 x 5 cm Material : ABS Note: Due to the different images shown, the actual color should apply. The dimensions are measured by hand, there may be errors (1-2 cm).