1、【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. 2、【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. 3、【High Quality\u0026Durable】-The frame is made of high quality ABS plastic with long-life use, while the transparent flap let pet see through the door. 4、【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. 5、【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. 6、【Suitable for Small Pets】-3 optional sizes for your choose and it is both suitable for kitty and small puppies, even a small dog can get through it. 7、【Easy Cut to Fit Walls】The thickness of Medium Size and Large Size door can be scaled to fit walls or people doors of different widths. The pet door allows you to install a exclusive door into an interior or exterior wall or a people door.  It processes a ferromagnetic snap and 2 sliding blocks to achieve pet access control. Made of professional manufacturer, it features polished inner  frame edge and silent brush to ensure it would not hurt your fur babies. It is very practical and give your pet the freedom to come and go. Features: 【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. 【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. 【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. 【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. 【Suitable for Small Pets】-3 optional sizes for your choose and it is both suitable for kitty and small puppies, even a small dog can get through it. 【Easy Cut to Fit Walls】The thickness of Medium Size and Large Size door can be scaled to fit walls or people doors of different widths. Any problem, please contact our store without hesitation. Honor to serve you. Specification: Item Name: Pet Door Main Material: ABS Plastics Optional Color: White/Brown Item Size: S: Outer Size: 20 * 19.2 * 1.8cm; Inner Size: 15.5cm * 14.7cm ( Length&Width); Chest Range:<20cm M: Outer Size: 20 * 19.2 * 5.5cm; Inner Size: 15.5cm * 14.7cm ( Length&Width); Chest Range:<40cm L: Outer Size: 25 * 23.5 * 5.5cm; Inner Size: 19cm * 18cm ( Length&Width); Chest Range:<60cm Package Size: S: 20.5 * 20* 2.5cm; M: 20.5 * 20 * 6cm; L: Outer Size: 26 * 24 * 6cm; Package Weight: S: 270g; M: 350g; L: 454g General box package. Note: * Please allow 1-2 cm difference due to ensures pets can get through the door. * There could be a few deviations due to manual measurement or slight color difference owing to photographing condition. Thank you for your understanding. Package List: 1 * Pet door 1 * Screw Kits 1 * Sponge Tape 1 * Pet door 1 * Screw Kits 1 * Sponge Tape