The Nano board compatible with arduino has an operating voltage of 5V.
The Nano board compatible with arduino has 14 Digital input / output ports: TX, RX, D2 ~ D13.
This Nano microcontroller is compatible with arduino uses Atmel Atmega328P-AU MCU.
The CH340 Nano microcontroller board can be powered via the mini-USB connection, 6-20V unregulated external power supply (pin 30), or 5V regulated external power supply (pin 27). The power source is automatically selected to the highest voltage source.
The size of Nano V3.0 with CH340 Chip is only 43 mm x 18 mm