Features: 4 way locking modes: fully locked, both in and out, in only, out only. Makes it easy to control your pets in and out, no more waiting for your pets to come in or go out. The brush strip on flap reduces when noise from door opening and closing. Suitable for installation on viewing windows, sliding glass doors, glass windows, etc. Made of premium ABS plastic, which is weather-resistant and durable. Specification: Item type: Cat flap door Color: Transparent Material: Plastic Size: S: outer size: 30*30*4cm, flap size: 18.5*20.5cm, mounting hole diameter: 26.7cm Package Includes: 1 * Pet Door TRANSPARENT DESIGN: Fully transparent cat door is used for installing indoor or outdoor doors, which can effectively help pets see outside through the door, suitable for installing on glass windows and glass doors. SILENT BRUSH: The inner door frame edge is designed with fine bristles, which can reduce the noise and won't scare the pet or disturb the owner when the pet goes in and out. MAGNET POSITIONING: Silent magnets can be quickly reset when pets enter or exit without making any noise, and the door automatically closes when entering or exiting to prevent other animals from entering. 4 WAYS IN AND OUT: The cat door has 4 different ways to control the entry and exit, feel free to control the pet in and out, suitable for cats and puppies, small pets and puppies can pass through. EASY INSTALLATION: With its simple and user friendly design, this cat door can be easily installed in no time, saving you the hassle and inconvenience.