Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
First, each tag has a unique ID that can be read and written by NFC-enabled devices like smartphones.
Source: https://www.chartattack.com/how-to-program-nfc-tags/