NFC Smart Tag Card
These can be read by almost any 13.56MHz RFID/NFC reader.
These chips can be written to & store up to 1 KB of data in writable EEPROM divided into banks, and can handle over 100,000 re-writes. There is also a permanent 4-byte ID burned into the chip that you can use to identify one tag from another - the ID number cannot be changed.
- NFC SMART TAG CARD 1K S50 13.56MHZ RFID ISO14443A