Where is the serial number for my microchip cat house? Alan 18 February 2021 15:50 Updated The serial number for the Microchip Cat Door is located on the underside of the battery cover. Related articles How to know if my cat's chip will work with the microchip cat door? What is the guarantee on the microchip cat flap? How does the Self Heating Insulation work on the Cat Houses Whats your phone number / contact details? What's the size of the Cat Shelter window? Comments 0 comments Please sign in to leave a comment.