1.14 Digital input / output port RX, TX, D2 ~ D13,

2.8 analog inputs A0 ~ A7

3.1 pairs of TTL level serial port transceiver port RX / TX

4.6 PWM ports, D3, D5, D6, D9, D10, D11

5. Microcontroller using Atmel Atmega328P-AU

6. Support serial download

7. Support for external 3.3V ~ 12V DC power supply

8. Support 9V battery

9. 16MHz clock frequency