Features: 1. Near Field Communication (NFC) is an emerging short-range wireless communication technology that allows non-contact point-to-point data transmission (within ten centimeters) to exchange data between electronic devices. 2.It has been widely used in access control systems, bus cards, etc. , meal card and other mobile payment systems. And my design is based on the mainstream NFC chip PN532, which supports a variety of communication interfaces, allowing your for to easily realize the NFC function. 3. Onboard for 40pin GPIO interface, suitable for series motherboards. Onboard PN532 chip, support /NTAG2xx and other NFC/RFID cards 4. Support three interfaces: I2C, SPI and UART, and can switch different interface communication through jumper caps and switches 5. Lead out control pins for easy access to main control boards such as STM32/for Specification: NFC chip: PN532 Working voltage: 3.3V/5V Working frequency band: 13.56MHz Communication interface: I2C, SPI, UART (default) Factory communication baud rate: 115200 Operating mode: Reader mode, supports /IEC 14443A/IC mechanism Reader mode, supporting FeliCa mechanism Reader mode, supports /IEC 14443B mechanism Card operation mode, supporting 14443A/IC mechanism Card operating mode, FeliCa mechanism /IEC18092, ECM340 point-to-point Applications: Contactless payment systems, linking of bluetooth and wi-fi devices, social sharing features such as sharing contacts, photos and videos, NFC applications for smartphones Product size: 85 x 56mm Material: PCB colour: blue Package Contents: 1 x PN532 NFC expanding board 1 x IC Classic1K Card 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.