This is the Compatible board based on Arduino Technology and not an official Arduino Board. You can purchase Original and Official Arduino Boards here.
There are two versions of Pro Mini:
Pro Mini ATMEGA328P 3.3V/8MHz
Pro Mini ATMEGA328 5V/16M
The Pro Mini is a microcontroller board base on the ATmega328P. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, an on-board resonator, a reset button, and holes for mounting pin headers.
A six pin header can be connected to an FTDI cable to provide USB power and communication to the board. The Pro Mini Arduino is intended for semi-permanent installation in objects or exhibitions. The pin layout is compatible with the Mini Arduino.