This is a FTDI FT232RL usb/serial chip embedded in a cable that has a 6-pin socket at the end. These are perfect for use with a Boarduino, Meggy's, or other Arduino clones, and Fuzeboxen. Useful whenever you want to communicate with a TTL serial device, such as an XPort, GPS, XBee or SIM module through a breakout board.
The version we have is the 3.3V. The data signals are at 3V and the power line provides 5V. We suggest this for any product that needs FTDI cables. Because the cable is 5V compliant, you can use it with 3v or 5v logic just fine - no level shifting required!.