RFID-RC522 module is based on the philips mf522-an board and is delivered together with an s50 card, key ring and two matching pin strips. Supported card types: for mifare1 s50, mifare1 s70, mifare ultralight, mifare pro, and mifare desfire. The module adopts a voltage of 3.3v, can directly connect with any cpu motherboard of the user through several simple lines of the spi interface, which can ensure stable and reliable operation of the module and long reading distance. It is applicable for the users who need to design or manufacture the rf card terminal, for example, the development of access controls, electronic door locks or terminals for the time recording. This module can be directly loaded into the various reader molds. It can be used with arduino, raspberry pi and micro-controller.