Petsafe petporte microchip smart flap made from uv resistant plastic has an integrated chip reader which only lets your own cat go through the flap there is no need for dangerous cat collars and uninvited guests cant get in an integrated transponder reader in the petporte smart flap reads the number on your cats micro chip the transponder can be programmed to recognise chip numbers for up to 25 cats an integrated light sensor reacts to various shades of darkness and enables you to stop