When you need more features than everyone else's basic FTDI, you get the FTDI Pro. The FTDI Pro is a USB to UART converter that can be used to program and communicate with the Mongoose 9DOF IMU, as well as many other Arduino development boards. It can also be used for general purpose serial communication with other microcontrollers. It supports auto reset with the DTR pin when you use it with the Arduino dev tools to download a new sketch. It also has Tx and Rx LEDs so you can see traffic on the UART lines. On the back side, we've added two mini slide switches. One switch allows the IO voltage to be changed so that you can power and communicate with your project at either 3.3V or 5.0V. A red and green LED indicates which voltage is selected. The other switch is used to swap the Tx and Rx pins, so you don't need to use wires if your project has reversed Tx and Rx pins.