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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 atmega328p - au microcontroller, external 3.3 v ~ 12 v dc power supply, support 9v batteries, size: 33.3 x 18.0mm.