nullFeature:Professional version of the Pro is a micro controller circuit board.It has 20 digital input/output pin (six of them can be used as a PWM output), 8 analog input, a 16MHZ resonator, a reset button, the installation hole lead foot.Technical parameters:14 digital input/output port RX and TX, D2 ~ D138 analog input port A0 ~ A71 pair of TTL level serial port transceiver port RX / TX6 PWM port, D3, D5, D6, D9, D10, D11Using Atmega328P - AU microcontrollerSupport serial downloadSupport for external 5 V ~ 12 V dc power supplySupport 9v battery powered16 MHZ clock frequencySize: 33.3 x 18 mmPackage included:5 x Pro Mini ATMEGA328P 5V/16M Improved Version Module