These NFC cards are read/writable so you can change the data as many times as you want. The data can be locked so the card is read-only. Once the NFC card is locked, it cannot be unlocked. The NXP NTAG213 comes NDEF formatted by the manufacturer. The chip inside the badge is a very fast modern chip with good reading range. WARNING: These NFC tags cannot be used on metal, aluminum or electronic surfaces. An on-metal NFC tag should be used instead.
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