The PetSafe Microchip Cat Door Tunnel Extension PAC54-16248 is designed to add 2 inches of depth to your cat's access point. This product, made by the trusted brand PetSafe, utilizes a secure microchip lock mechanism to ensure that only your cat can enter the extension. As an authorized retailer, you can trust that this product is reliable and legitimate, providing peace of mind for both you and your pet.