HiLetgo RFID Kit - Mifare RC522 RF IC Card Sensor Module + S50 Blank Card + Key Ring for Arduino Raspberry Pi The MF522-AN module design the circuit of card read by using the original Philips MFRC522 chip. Easy to use, low cost, and applicable to equipment development and card reader development etc. Applicable for the user who need to design or manufacture the RF card terminal. The module can be directly loaded into the various reader molds. The module use a voltage of 3.3V, it can connected communication with user's any CPU mainboard through several lines of SPI interface, it can ensure stable and reliable work, and reader distance.