Using an RFID module
Passive RFID tags are basically just little antennas with an extremely low power integrated circuit. When the IC is activated by power induced by the antenna, it generates a signal to transmit a small amount of data, such as an ID number.
This RC522 RFID module can read RFID tags and write to RFID tags that support writing. The RFID tag has a 4-byte (or 32-bit) UID, which means there are about 4.3 billion unique possibilities. Although that sounds like a lot, there are some situations where it's not considered enough to prevent collisions or brute-force guessing.
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