KNACRO PN532 NFC Module 13.56MHz 3.3V Board for Arduino Raspberry PI Longest effective communication distance of 3 cm. Supports switching of SPI, IIC and UART interface. Equipped with onboard antenna, no external antenna coil is needed. Based on PN532 chip,can be used for 13.56M non-contact communication. Compatible with ISO14443 Type A and Type B standards