My RFID Module - Elechouse PN532 NFC RFID Module V3 Product page ~ Newer version of Elechouse PN532 NFC RFID Module V4 Please note: V4 is completely compatible with V3 on hardware and software. V4 keeps exactly the same shape, installing holes and interface as V3. Due to improved PCBA design and assembly technology, PN532 NFC V4 performs much better than V3.