-Powerful expansion shield for Arduino Mega Due
-3 Xbee slots, 1 microSD slot, and shield headers for most Arduino shields
-Breakouts for Digital pins 14 to 53, Analog pins 6 to 15 and PWM pins 2 to 9
-Gravity interface for plug-and-play of Gravity series sensors
-Standard Arduino UNO pinout to stack more Arduino Shield
-Integrated voltage regulator for 3.3v
-Convenient reset push button and standard on-board LED
-External power connector for servos and screw terminals for large power supply
-MicroSD for sensor monitoring and data gathering for research and algorithm optimization.

Specifications:

•Compatible with most Arduino shields
•Compatible with Arduino Mega boards / DFRobot megaADK / Arduino megaADK
•Extended TTL connection pins for four Serial ports
•DIP prototyping area makes it easy to add more modules or electronic components
•3 Xbee slots
•1 microSD slot
•Power switch between Arduino Mega or external
•Size: 125 x 57 mm(4.92×2.24″)