Pet product company, Pet Mate have developed a cat flap that, by using Radio-frequency identification (RFID), can restrict access to and from a property for up to eight individual cats. In other words, if you own more than one cat and you don’t want certain cats going outside for whatever reason, you can set the timer on the control device for whenthose cats are allowed access and then, by attached a small disc to the cat (by collar I assume), the RFID system in the cat flap will know to either lock or unlock the cat flap depending on which cat approaches the cat flap. Capeesh? No? Well, read about it here.