【High Quality&Durable】-The frame is made of high quality ABS plastic with long-life use, while the transparent flap let pet see through the door. 【Automatically Close】-There exists a ferromagnetic snap. After your pet pass through the door, it will get closed automatically, which can preventing mosquitoes from entering the house. 【4 Locking Systems】-The door have 4 modes by switching the 2 sliding blocks: IN Only, Out Only, Both In and Out and Fully Locked. It is very easy to control and give your pet the freedom to come and go. 【Considerate Details】-Inner frame edge get polished so as not to hurt cat. Screw reinforcement to prevent falling off and the silent brush allows it not to make noise. 【Easy to Install】-You can Install it into all types of doors, including glaze door and timber. It is easy to install following the step-by-step instructions.