1.14 digital input/output ports TX, RX, D2~D13
2.8 analog input ports A0~A7
3.1 TTL level serial port RX/TX
4.6 PWM ports, D3, D5, D6, D9, D10, D11
5. Using ATMELATMEGA328P-AU microcontroller
6. Supports USB download and power supply
7. Support external 5V~12V DC power supply
8. Supports 9V battery power supply
9. Support ISP download
10. Three power supply methods: USB, VIN, external 5V input