Wicklow - PetSafe Microchip Cat Flap (White) – Automatic Open/Lock Door. The PetSafe Microchip Cat Flap reads the most common type of microchip implanted in cats - FDX-B (15-digit). If you are not sure what type of microchip your cat has, try our microchip compatibility checker, and enter your cat’s microchip ID to verify that your microchip is compatible.