4 Switching Modes Cat Door - The pet door could be adjusted by the Red and Green switches to 4 modes: out only, in only, both in and out, and fully locked, easy control of your pet's in and out. They won’t feel trapped anymore and you no longer bother to open or close car doors for them. Make your life easier and your pet feel free. Size And Application - XL Size Outer Size 9.64*11.22*2.16"(W x H X D), suitable for cats lighter than 27.54 lb and waist circumference shorter than 24.8".Suitable for most cats and small dogs (Pomeranian, Yorkshire Terrier, Pekingese, Dachshund, etc.).Sailnovo cat door interior door is not just a passage, but a key to adventure for your pet, accommodating both cats and small dogs in multi-pet households. Easy Installation - Sailnovo pet door is suitable for brick walls, wooden doors, PVC doors, metal doors, interior doors, exterior doors, and can be installed in doors and walls with a thickness of 2 - 5 cm. Step by step installation image descriptions included in sales box for you reference,easy to install as your need.. If you have any questions during kitty door installation, please get in touch with us. Quiet and safe - Sailnovo car flap door is extremely quiet and offers optimal protection against drafts with a special seal and a magnetic closure. The brush strip can eliminate the noise when opening and closing the interior cat door, and can block raindrops, wind or mosquitoes to the greatest extent. This brush strip is also safe for your baby's paws and tail. Prevent pet hair from getting stuck in door panels and causing injuries. This allows pets and owners to live happily together. Design for your cat - Sailnovo's clear cat door is made of high-strength fiberglass ABS, which is UV-resistant and impact-resistant to prevent pet attacks and bites. The pat door is also moisture-proof, wear-resistant, and durable. The transparent flap allows your pet see through the door, enriching the lives of your adventurous pet. Designed for your cat’s preference and makes it easy to use.