The NFC Shield V2 for Arduino is a widely used technology around us. It's behind daily applications such as access control systems and mobile payment systems. NFC Shield features a highly integrated transceiver module PN532 which handles contactless communication at 13.56MHz. You can read and write a 13.56MHz tag with this shield or implement point to point data exchange with two NFC Shields. This new version includes an independent PCB antenna which can easily stretch out of any enclosure you use, leaving more room for you to design the exterior of your project.
NFC Shield V2.0 Wiki: http://www.seeedstudio.com/wiki/NFC_Shield_V2.0
PN532 Library: https://github.com/Seeed-Studio/PN532