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The is compatible with official board, using the same chips 340 with the official version. It is a smallest, complete, and breadboard friendly board. It has everything that official board has (electrically) with more analog input pins and onboard +5V AREF jumper. got the breadboard-ability and the Mini+USB with smaller footprint than either, so users have more breadboard space. It's got a pin layout that works well with the Mini or the Basic Stamp (TX, RX, ATN, GND on one top, power and ground on the other). can be powered via the Mini-B USB connection, 7-12V 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.