The RFID tag has a built-in chip. The built-in chips have their own ID. Each FID tag has a separate UID label. Usually, it binds a certain product to an RFID tag (having a unique ID). The relationship between them belongs to a kind of binding, it is like to assign someone a unique ID number. With UID, you can avoid the phenomenon of false.

In the early days, there was no serial number in the label. Each label had a unique ID, which could also be understood as an ID number. This unique ID was applied by the manufacturer to an organization and there would be no reuse of RFID labels. , or multiple products corresponding to a label, the current cost of an RFID tag is about one or two cents or so.