If your pet is not microchipped, the SureFlap RFID Collar Tag is available as an alternative*. SureFlap collar tags contain a code that is unique to your pet so that if other pets in the neighbourhood have a SureFlap collar tag, or any other type of collar tag used in selective pet doors, they will not be able to gain access. 

Key points 

Compatible with all versions of the SureFlap Microchip Pet Door 
Compatible with the SureFlap Microchip Cat Door with serial numbers higher than 1152201 
For use with non-microchipped pets 
Each collar tag has a unique code 
Each pack contains two collar tags 
Collar tag diameter: 25mm 
Weighs just 2g