How do microchip cat flaps work? While regular pet doors let any animal walk into your home, the best microchip cat flaps restrict access to selected pets only.

Sureflap is magnetised to ensure that the flap closes quickly after a cat passes through it, and runs on batteries (unlike other exisiting microchip cat flaps) so there are no wires waiting to trip ...

In 2005, Hill, who has a PhD in quantum physics from Cambridge University in England, began devising a mechanical cat flap that would open only when activated by the microchip implanted in Flipper ...