Large cat door (external dimensions 22.3 cm x 19.2 cm), 4-way locking cat door for cats and small-girth dogs, easy to install Easy installation steps: can be carried out on wooden or PVC doors. Adapters required for brick walls, glass and patio doors Adapt to various climate conditions: thanks to its weather stripping and improved automatic double locking function, neither wind nor heat can enter Give your dog or cat greater freedom: it allows you to give your dog or cat maximum freedom; it is the ideal solution to let cats and dogs enter your home without having to open the door frequently. Your pet will be more independent Simple and practical locking: in addition to being easy to install, this door also allows you to give your dog or cat maximum freedom. Resistance: this pet door is strong and durable thanks to its hard transparent plastic blades and high-quality durable plastic frame; the door is suitable for most standard walls and doors There are four modes (1) Close the door lock in both directions. (2) Indicates that the door is open in both directions. (3) Allows cats to go out, but not let them in. (4) Allows entry but not exit. Easy installation, simple and elegant. Good quality, made of ABS material (imported ABS material) Large size, large size, suitable for many large cats. Size model: (support selection) Size M: Frame size: height 22.3*width 19.2*thickness 5.5cm Door cover size: inner height 15.5cm*inner door width 15cm Size L: Frame size: height 24*width 23.5*thickness 5.5cm Door cover size: inner height 19.5cm*inner door width 17 cm Shop Tips: 1. The size is manually measured, please allow for errors (1-3cm). 2. Due to different display pixels, there may be color differences, please refer to the actual product.