Description The professional version of the Arduino Mini Pro is a microcontroller circuit board. It has 14 digital input/output pins (six of them can be used as a PWM output), 8 analog inputs, a 16 MHZ resonator, a reset button, and the installation hole lead foot. Technical parameters:1. 14 digital input/output port RX and TX, D2 ~ D13,2. 8 analog input port A0 ~ A73. 1 to the TTL level a serial port to send and receive port RX/TX4.6 a PWM port, D3, D5, D6, D9, D10, D115. Using Atmel Atmega328P – AU microcontroller6. Support serial download7. Support external 3.3 V ~ 12 V dc power supply8. Support 9 v batteries9. 16 MHZ clock frequency10. Size: 33.3 * 33.3 (mm)