Adafruit RFID/NFC Leather Keychain

This is a blank 13.56 MHz RFID/NFC key fob. The fob contains a small RFID chip and an antenna, and it is powered passively by the reader/writer when placed a few centimeters away.

These can be read by almost any 13.56 MHz RFID/NFC reader, but make sure it can handle ISO/IEC 14443 Type A cards, as there are some other encoding standards. They have been tested and work excellently with our PN532 NFC/RFID breakout board and Adafruit NFC/RFID shield for Arduino.

These chips can store up to 1 KB of data in a writable EEPROM, which is divided into banks and can handle over 100,000 rewrites. You can use our PN532 NFC/RFID breakout board or Adafruit NFC/RFID shield for Arduino to read and write data to the EEPROM in the tag. Additionally, a permanent 4-byte ID is burned into the chip, allowing you to identify a tag from another - the ID number cannot be changed.

These use an ISO/IEC 14443 Type A chipset, which was previously the "classic" NFC chipset. In 2014, the NFC Forum decided to discontinue support for this chipset, so newer phones may not support it. This is only important if you are trying to use this tag with a phone or tablet.