Arduino Pro Mini 3.3V/8 Mhz The Arduino Pro Mini board is sent solderless with the male header next to it.

Arduino Pro Mini is a development/prototype board that works with 5V and has an Atmega328 microcontroller on it. The point that distinguishes Arduino Pro Mini from other boards is that there is no USB input or interface on it, so you need to load programs with a simple FTDI programmer to program Arduino Pro Mini).