Pet Door allows you to install an exclusive door in an interior or exterior wall or in a pet's door. It processes a ferromagnetic snap and 2 sliding blocks to achieve pet control. Made by a professional manufacturer, it has a polished inner frame edge and a quiet brush to avoid damaging your furry babies. It's very convenient and gives your pet freedom to come and go. Features: 【4 locking systems】 - The door has 4 modes by sliding the 2 adjustable blocks: entry only, exit only, entry and exit, and fully locked. It's very easy to control and gives your pet freedom to come and go. 【Auto-close function】 - There is a ferromagnetic snap. When your pet walks through the door, it closes automatically, preventing flies from entering the house. 【Premium quality and durability】 - The frame is made of high-quality ABS plastic with long lifespan, while the transparent flap allows pets to see through the door. 【Careful details】 - The inner edge of the frame is polished to avoid harming the cat. The screw reinforcement prevents falling and the quiet brush makes it noiseless. 【Easy to install】 - You can install it in all types of doors, including glass doors and wooden doors. It's easy to install by following step-by-step instructions. 【Suitable for small animals】 - 3 sizes available for your choice and it's suitable for both kittens and small puppies, even a small dog can pass through. 【Easy to cut for fitting walls】 - Medium and large door thickness can fit for wall or door frames with different widths. All issues, please contact our store without hesitation. Honoring your service. Specifications: Product type: Pet door Main material: ABS plastic Color options: White/brown Product size: S: Outer size: 20*19.2*1.8cm; Inner size: 15.5cm*14.7cm (length and width); Chest area: <20 cm M: Outer size: 20*19.2*5.5cm; Inner size: 15.5cm*14.7cm (length and width); Chest area: <40 cm L: Outer size: 25*23.5*5.5cm; Inner size: 19cm*18cm (length and width); Chest area: <60 cm Packing size: S: 20.5*20*2.5cm; M: 20.5*20*6 cm; L: Outer size: 26*24*6cm; Packing weight: S: 270g; M: 350 g; L: 454g General packing Notes: * Allow 1-2 cm difference due to ensuring pets can pass through the door. * Slight variations may occur due to manual measurement or minor color differences due to photography conditions. Thank you for your understanding.