The PN532 is the most popular NFC chip, and is what is embedded in pretty much every phone or device that does NFC. This Breakout comes with a Key-Tag as well as an NFC-Card. Because it can read and write tags, you can always just use this for RFID-tag projects. We carry a few different tags that work great with this chip. It can also work with any other NFC/RFID Type 1 thru 4 tag (and of course ...