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.
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I have ordered three Arduino Nano's from Vilros. There company is a great company to deal with. I received my items early and i am very pleased with there service. I would highly recommend Vilros to anyone who needs parts.