Arduino Pro Mini 3.3V ATmega328 running at 8MHz with external resonator (0.5% tolerance) Low-voltage board needs no interfacing circuitry to popular 3.3V devices and modules (GPS, accelerometers, sensors, etc) DC input 3.3V up to 12V Analog Pins: 8, Digital I/Os: 14 3.3V regulator (Max 150mA output)