1. 14 digital input / output ports RX, TX, D2 ~ D13,
2. 8 analog input ports A0 ~ A7
3. 1 TTL level serial port transceiver port RX / TX
4.6 PWM ports: D3, D5, D6, D9, D10, D11
5. Using Atmel Atmega328P-AU microcontroller
6. Support serial download
7. Support external 3.3V ~ 12V DC power supply
8. Support 9V battery powered
9. Clock frequency 16MHz
10. Size:33.3 * 18.0 (mm)