SainSmart MEGA, ATmega2560 + SainSmart Ethernet Shield for Arduino UNO Mega2560 R3 DuemilanoveRobot The SainSmart MEGA, ATmega2560 is a microcontroller board based on the ATmega2560. The SainSmart Ethernet Shield can be used to connect your Arduino board to internet. Buy them TOGETHER and get at the REDUCE price. It is a big bargain!!!