NFC Arduino Shield 13.56MHz - Stackable PN532 Reader tp01 it activates the first pin

it activates the first pin to output HIGH

which is the heart of the board

Adafruit METRO 328 without Headers - ATmega328 is designed for makers

Permit matched device connect by default

Output ripple: 30mA (maximum)

NFC Arduino Shield 13.56MHz - Stackable PN532 Reader tp01 it activates the first pinNFC(Near Field Communication) is a set of standards for smartphones and similar devices to establish radio communication with each other by touching them together or bringing them into close proximity , it builds upon RFID systems by allowing two way communication between endpoints. Compared with the Bluetooth, which is also short range communication technology, NFC operates at slower speeds, but consumes far less power and doesnt require pairing.