If you are building applications using RFID or NFC technology you may be interested in a new blank bracelet now available from the Adafruit online store. The 13.56MHz RFID/NFC Bracelet is equipped with a NTAG203 Chip and is priced at just $3.95. RFID chip specifications : 144 bytes of user r/w memory area, divided in 36 pages (4 bytes each), 7 Byte unique identifier burned into the chip and an operating frequency of 13.56 MHz.
The blank RFID can be used with almost any 13.56MHz RFID/NFC reader, but make sure it can handle ISO/IEC 14443 Type A cards (the standard NTAG uses) as there are a few other encoding standards (like FeLica), says Adafruit.
“Often used for train/bus passes, information sharing, contactless payment, but also found in other systems where a proximity card is desired. The bracelet contains a small RFID chip and an antenna, and is passively powered by the reader/writer when placed a couple inches away.
These chips can be written to and store up to 144 bytes of data in writable EEPROM divided into 4 byte banks, and can handle over 10,000 re-writes. You can use our PN532 NFC/RFID breakout board or Adafruit NFC/RFID Shield for Arduino to read and write data to the EEPROM inside the tag. There is also a permanent 7-byte serial number ID burned into the chip that you can use to identify one tag from another – the ID number cannot be changed.”
For more details and full specifications jump over to the official Adafruit online store.