1. 12 digital input/output ports D2-D132, 8 analog input ports AO-A7
3. 1 pair of TTL level serial port transceiver ports RX/TX
4. 6 PWM ports, D3, D5, D6, D9, D10, D115, using Atmel Atmega328p-AU microcontroller
6. Support USB download and power supply
7. Support external 3.3V-12V DC power supply 8. Supp lithium battery and 9V battery power supply
9. Support ISP download