This NFC shield based on the PN532 from NXP, it works on ISM band of 13.56MHz, with the built-in NFC Antenna, the communication range would be about 2cm,Arduino Compatible Arduino Shield Programmer in elecrow.com. https://elecena.pl/product/6165266/nfc-pn532-shield 2016-06-30 https://elecena.pl/product/6165266/nfc-pn532-shield 2017-08-30 https://elecena.pl/product/6165266/nfc-pn532-shield 2026-06-17