SainSmart C28 Kit with Mega2560 + Mega Sensor Shield v2.0 for Arduino UNO R3 MEGA Mega2560 Nano DUE Duemilanove AVR ATMEL Robot XBee ZigBee The SainSmart Arduino MEGA, ATmega2560 is a microcontroller board based on the ATmega2560. Sensor Shield allows you to connect to various modules like sensors, servos, relays, buttons, potentiometers Buy them TOGETHER and get at the REDUCE price. It is a big bargain!!!