Technical parameters of Nano:
One12 digital input / output port D2~D13,
2.8 analog input port A0~A7
3.1 on the TTL level of the serial port RX/TX
4.6 PWM ports, D3, D5, D6, D9, D10, D11,
5 using Atmega328P-AU Atmel single chip microcomputer
6 support USB download and power supply
7 support external 5V~12V DC power supply
8 support 9V battery power supply
9 support ISP Download
With USB cable need extra 0.25$