Seeed nfc shield with antenna spi interface v2 0 seeed studio 113030001 p the nfc shield from seeed studio lets your arduino read and write 13 56mhz rfid tags a separate pcb antenna is included giving you more flexibility the shield itself has two grove connectors for access to seeed s large array of add on modules extension headers to plug in other shields and an extension connector for the icsp signals seeed have provided a software library and several examples on the a href http