RFID NFC Kit PN532 with S50 Card and S50 Key Tag

This PN532 RFID module can also send data via NFC, in addition to sending and receiving Mifare tags.
The module can be controlled via SPI, I2C or UART.

Specifications:

• Chip: NXP PN532
• Voltage: 3.3 - 5V DC
• Supports various RFID products including Mifare and FeliCa
• Reading distance: ~5-7cm
• Levelshifter for I2C and UART present for compatibility with 5V systems (SPI only 3.3V!)
• Two DIP switches are present to select communication mode (HSU = High Speed UART)
• Comes with a S50 card, S50 key tag, 4 pins curved header and cable
• Two 3mm mounting holes present 

See the datasheet for more information: NXP PN532
For the Arduino library, check this Github page: elechouse/PN532