【MATERIAL】The cat flap is 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 has a magnetic closing method, very quiet. It will not make any noise even if it is repeatedly entered and exited. 【PRACTICAL LOCK】The button-style knob is rotatable in 4 directions. You can easily rotate it to 4 positions with the arrow and icons to control your cat's access options: in only, out only, free in and out, fully 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 panels, glass doors and wooden doors to control pets' entry and exit as needed. 【APPLICABLE FOR】Inner size (L x W x H) 18 x 18 x 1.5 cm, it is suitable for cats whose waist circumference is less than 60 cm. And the outer size is (L x W x H) 20 x 20 x 2 cm. It is suitable for installation on interior doors, exterior doors, walls, windows, wardrobes, glass, etc. 【EASY INSTALLATION】This 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 2-5 cm. Includes detailed installation instructions and picture descriptions. If you have any questions during installation, please do not hesitate to contact us.