I am sorry for being vague. I don't know what else to say. Here is a link to the product and in that link there are Arduino sketches. Nothing in there helps me use the "tag" number for any useful purpose. I can't even find out what the structure of the "tag" digits are (other than being a 13 digit number) that is sent to the Arduino when a "tag" comes into proximity tot he detector. I was hoping someone who has worked on the Qwiic RFID IDXXCA would be able to help. SparkFun Qwiic RFID-IDXXLA Hookup Guide - SparkFun Learn.