Professional version of the Mini 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.

General Specification

14 digital input/output port RX and TX, D2 ~ D13
8 analog input port A0 ~ A7
1 pair of TTL level serial port transceiver port RX / TX
6 PWM port, D3, D5, D6, D9, D10, D11
Using Atmega328P - AU microcontroller
Support serial download
Support for external 5 V ~ 12 V dc power supply
Support 9v battery powered
16 MHZ clock frequency
Size: 33.3 x 18 mm