This Cat Door has four modes to choose from, including "in only", "out only", "both in and out", and "fully locked". You can easily adjust the mode with the knob according to your needs and your pet's preferences.
The installation drawing on the package shows how the door can be easily installed. 16 pcs screws can be used for doors thicker than 1.3 inches(3.4cm).
Whether your cat likes to play indoors or enjoys basking in the sun outdoors, this cat flap door can meet your needs. It allows your cat to come and go freely while keeping your home clean and safe.