Plug & play on the mini pro. No need to solder the pins are in front :) I recommend this truly excellent product that allows to use microcontrollers to 3.50 euros as easily as with the Arduino more expensive models (equipped and ftdi usb port). Directions: pine is threaded directly on the side of the mini pro (leaning map the connection is done perfectly), switch the setting of the ft2323 on 3.3V and ... that is all ^^.