1. Perfect Cat Door: A great solution to give your cat access to any interior room, while giving you complete control. The cat door with lock have 4 switch modes, the pet doors for cats could be adjusted by the red and green switches with tabs 2. EASY TO INSTALL : The cat doors for interior doors have detailed installation steps, this large cat door can be installed easily in a short time. 14 screws and its caps included in the set make you easily install in doors, cupboards, panels and walls, etc 3. Size & Application --- Outer size 7.5" x 7.8" x 2"(W x H X D), inner size:6.1" x 6.3"(W x H), cut-out size: 6.3" x 6.7" (W x H), suitable for installation on doors and thin walls, suitable for cat lighter than 16 lb and waist circumference shorter than 15.75" improved weather. 4. : Made of ABS material, weather-resistant, the surface is smooth and durable. It provides a fixed groove with snap tabs for weather-proof brush strip, firmly fix the brush strip. Even if the brush strip comes off, easy to put it back into the fixed groove. This greatly help the brush strip reduce noise, stop rain drop, wind or pest like mosquito to the most.