These NFC tags are read/writable so you can change the data as many times as you want. The data can be locked so the tag is read-only. Once the NFC tag is locked, it cannot be unlocked. The NXP NTAG203 comes NDEF formatted by the manufacturer. This chip 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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