Iduino Mini Pro Is A Micro Controller Circuit Board. It Has 14 Digital I/O, 8 Analog Input, 16 Mhz Resonator, 8 Analog Input Ports A0 ~ A7, Pwm Port, D3, D5,D6, D9, D10, D11, Uses Atmel Atmega328 P Au Microcontroller, External 3.3 V ~ 12 V Dc Power Supply, Support 9v Batteries, Size: 33.3 X 18.0mm.