CONVENIENT LOCKING --- The button switch is 4-way rotatable, you can easily rotate it into 4 positions with the arrow and icons to control your cat's access options: self, out, in and out only, fully blocked. ? IMPROVED BRUSH DRAFT WEATHERPROOF --- Provides a firm groove with snap tabs for the weatherproof brush strip, firmly fixing the brush strip. Even if the brush comes loose, it is easy to put it back into the fixed housing. This helps the brush reduce noise, stop rain, wind or pests such as mosquitoes as much as possible. ? SCREW RISKS --- Comes with 2 packs of 8 screws each, one with short screws and the other with long screws. Screw them on both sides to avoid breakage, not just on one side. You can make 8 screws for the 4 screw holes with the long + long, long + short or short + short assembly, depending on the depth of the door/wall to be installed. APPLICABLE TO --- Inner dimensions 15 * 15.5. And the outer size is 19 * 5.5 * 22 It can be installed on interior doors, exterior doors, walls, windows, cabinets, glass, etc.