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.
1. 14 digital input/output port RX and TX, D2 ~ D13, 2. 8 analog input port A0 ~ A7 3. 1 to the TTL level a serial port to send and receive port RX/TX 4.6 a PWM port, D3, D5, D6, D9, D10, D11 5. Using Atmel Atmega328P – AU microcontroller 6. Support serial download 7. Support external 3.3 V ~ 12 V dc power supply 8. Support 9 v batteries 9. 16 MHZ clock frequency 10. Size: 33.3 * 33.3 (mm)