Does anyone know what the difference Arduino Compatible Mega2560 ATmega2560-16AU USB Board to the Arduino USB Board Compatible ATmega2560 Mega2560 sold on DealExtreme. The first is U.S. $ 17.99 and U.S. $ 20.30 the second. Noted that it seems that the plate has two crystals. Grateful for help. LINK…

Arduino Compatible Mega

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