The ITEAD PN532 NFC module, as its name suggests, is based on the PN532 chip for near field communication at 13.56MHz. The module is equipped with an on-board antenna, so there is no external antenna coil. It is compatible with SPI, IIC, UART interface for communication. With NFC library support and the development of NFC-enabled products for the we offer, it's easy to use. The effective communication distance is 5 cm Support SPI, IIC, UART interface switching. Can be used for 13.56M contactless communication Compatible with ISO14443 TYPE A and B standards Chip NXP PN532 Working voltage 3.3V Power supply voltage 3.3~5.5V Maximum supply current 150mA Operating current (standby mode) 100 mA Operating current (write mode) 120 mA Operating current (read mode) 120 mA Pointer PWR Interface 's 20pins interface standard SPI interface Colour: blue Material: PCB Size: 79x48x11mm Package Contents: 1 * Reader Module Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.