Model Number: Nano-V3.0-CH340 Brand: Arduino Arduino Nano CH340 has a lower cost USB-Serial Chip that makes it less in than Arduino Nano with FTDI USB-Serial Chip used on older versions of Arduino Nano. The Arduino Nano is a small, complete, and breadboard-friendly board based on the ATmega328 (Arduino Nano 3. x). It has more or less the same functionality of the Arduino Duemilanove, but in a different package. It lacks only a DC power jack, and works with a Mini-B USB cable instead of a standard one. Arduino Nano can be powered via mini-USB connector, 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.