The Nano can be powered via the Type-c connection, 5v ~ 12v DC power supply.The power source is automatically to the highest voltage source The nano has 8 analog inputs,each of which provide 10 bits of resolution.By default they measure from ground to 5 volts, though is it possible to change the upper end of their range using the analogReference function. Analog pins 6 and 7 cannot be used as digital pins,some pins have functionality It is a smallest, complete, and breadboard friendly board Atmega328P-AU single chip microcomputer is adopted Support 9V battery power supply and support ISP download 1. 14 digital input/output ports TX,RX,D2~D13 2. 8 analog input ports A0~A7 3. 1 pair of TTL level serial port RX/TX 4. 6 pcs PWM port,D3,D5,D6,D9,D10,D11 5. Support USB download and power supply 6. Support external 5v ~ 12v DC power supply Material: PCB colour: blue Package Contents: 2 x Nano Boards 2 x Pin Unsoldered 4 x Pin Headers Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.