This pet door is equipped with a 4-way locking system， so that your cat and dog can safely enter and exit at will. They can go out and play with the kitten next door， or rest in the sun and easily complete their daily tasks. The door can be set with four modes: free access， out only， in only and locked. When your pet easily pushes the transparent and hard flap in and out， the flap will return to its original position. Moreover， the wind brush strip design around the flap opening helps to isolate the outdoor cold and hot air from your house， so as to provide higher energy efficiency. This locked cat door can also save you some time and has many benefits. It will definitely give you peace of mind and rest assured!
Installation method:
Required tools: screwdriver or electric drill， iron saw or electric saw， measuring ruler;
Step1: first draw the size of the door cover with a piece of paper (there may be a few millimeters of error);
Step2: make the drawing， draw on the door， and mark it with a pencil;
Step3: drill a hole in the four corners of the painted door with a drill， and then directly start digging if there is an electric saw;
Step4: if it is a glass door， use a glass cutting tool to gently open it and fix it with glass glue;
Step5: after the hole is dug out， in order to be beautiful， first get a layer of wood skin and wrap around the hole;
Step6: install the cat door. There are accessory screws. Screw them with a screwdriver;
Step7: the screw port is also equipped with a screw cover. Press the screw cover and the whole installation is completed!

• 4 ways of locking: it can be adjusted through the red and green mark switches. It can be set to 4 modes: free access， in only， out only or locked. It is easy to adjust， so that your pet can get in and out easily
• 2 sizes: S size: outer door frame: 7.76x7.48x2.09 inch， inner door frame: 6.3x6.18 inch， cat and dog size: up to 14 pounds; L size: outer door frame: 9.84x9.25x2.09 inch， inner door frame: 7.5x7.1 inch， cat and dog size: up to 20 pounds
• Easy installation: the pet door has detailed installation instructions， which can be easily installed in a short time. The kit contains 8 screws and their caps， allowing you to easily install them in doors， cabinets， panels and walls
• Safe and considerate: the pet door is transparent and can see through the inside and outside of the room. It is equipped with a mute brush， which can reduce the noise of closing the door and reduce energy loss. The 4-way locking of the big cat door meets the daily needs of the cat. The cat door is equipped with a magnet. When the cat and the dog passes by， the door can be reset quickly. The edges of the inner frame are highly polished and will not hurt cats and dogs