Arduino Nano 3.0 is ATmega328 based general purpose development board; small in size, with complete functionality and breadboard friendly.
Arduino Nano 3.0 does not have a DC power jack, and works with a Mini-B USB connector on the board instead of a standard one. It can be powered via the Mini-B USB connection or 6-20V unregulated external power supply (pin 30), or 5V regulated external power supply (pin 27). The board automatically selects the highest voltage source as the power source.
Note: This board is Arduino Nano 3.0 compatible clone. For detailed documentation, please refer here.