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? Whats your phone number / contact details? Do You Make Bespoke Customer Items? What is the guarantee on the microchip cat flap? Comments 0 comments Please sign in to leave a comment.