This is a blank 13.56MHz RFID/NFC keychain fob. It has a small RFID chip and an antenna, and gets power from the reader/writer when it's just a couple of inches away. Almost any 13.56MHz RFID/NFC reader can read it, but make sure the reader supports ISO/IEC 14443 Type A cards as there are other encoding standards. It works great with our PN532 NFC/RFID breakout board and Adafruit NFC/RFID Shield for Arduino! The chips can store up to 1 KB of data in writable EEPROM divided into banks, and can handle over 100,000 re - writes. You can use our mentioned boards to read and write data to the tag's EEPROM. There's also a permanent 4 - byte ID on the chip for tag identification. The ISO/IEC 14443 Type A chipset was once the 'classic' NFC chipset. Since around 2014, the NFC forum stopped supporting it, so newer phones don't support it. This only matters if you plan to use the tag with a phone or tablet.
Using this 13.56MHz RFID/NFC keychain fob is easy. First, get a compatible reader like our PN532 NFC/RFID breakout board or Adafruit NFC/RFID Shield for Arduino. When you want to read or write data, just place the fob a couple of inches away from the reader, and it'll get powered up. You can store up to 1 KB of data in it. Note that there are other encoding standards, so make sure your reader supports ISO/IEC 14443 Type A cards. Also, newer phones may not support this type of chipset, so if you want to use it with a phone, keep that in mind. For maintenance, just keep it away from extreme heat, moisture, and strong magnetic fields. With proper care, it can handle over 100,000 re - writes. The permanent 4 - byte ID on the chip can help you tell one fob from another, and you can't change this ID.
