MATERIALCat flap made of ABS plastic, safe and healthy, strong and durable, windproof and waterproof, and can be used for a long time. The bottom of the door adopts a magnetic closing method, very quiet. It will not make any noise even if it is entered and exited repeatedly.CONVENIENT LOCKThe knob-style button is rotatable in 4 directions. You can easily rotate it in 4 modes with the arrow and icons to control your cat's access options: in only, out only, free in and out, totally locked.APPLICATION Cat flaps are suitable for many small pets, kittens and puppies. It can be installed on interior and exterior doors such as wall tiles, glass doors, and wooden doors to control the entry and exit of pets as needed.APPLICABLE FORInner size (L x W x H) 22 x 20 x 4 cm, it is suitable for cats whose waist circumference is less than 60 cm. And the outer size is (L x W x H) 25 x 24 x 5.4 cm. It is suitable for installation on interior doors, exterior doors, walls, windows, closets, glass panes, etc.EASY INSTALLATIONThis pet flap is suitable for brick walls, wooden doors, PVC doors, and metal and can be embedded in doors and walls with a thickness of 2 to 5 cm. Includes detailed installation instructions and picture descriptions. If you have any questions during installation, please feel free to contact us.