RFID cat flap

Some time ago i installed a cat flap to make things more easy for the two cats. The only problem was that the door also was used by the neighbors big red oriental to kick some cats ass and steal food.
The solution was to get a cat flap that can read the microchip implant identifying integrated circuit placed under the skin of each cat.
Now everything works fine except for some fighting on each side of the door.
It can be locked from the inside and it also has a night program that allows the cats to enter, but locks from the outside when it gets dark.

Pet Porte Smart Flap Microchip Cat Flap