The board comes pre-loaded with the SparkFun USB to Serial COM Port firmware. When the board plugs into a USB port, Windows will ask for a driver, point to the driver .inf file found . The board should now enumerate as a 'SparkFun COM Port' and act the same as the SparkFun FTDI Basic. In other words, you can use it as a USB to serial bridge or you can use it to load code with Arduino. In addition, the pinout on the end of the board is the same as the FTDI Basic, which means you can plug it directly into boards like the Arduino Pro. Project description, more information and ordering can be found at https://www.sparkfun.com/products/10277 Firmware (SparkFun USB to Serial COM Port)': https://github.com/a1ronzo/SparkFun-USBtoSerial SparkFun Driver (INF): http://dlnmh9ip6v2uc.cloudfront.net/datasheets/BreakoutBoards/sparkfun_USBtoSerial_driver.inf