Seeeduino Mega (Seeed ARD121D2P) ATmega2560

http://garden.seeedstudio.com/index.php?title=Seeeduino_Mega

In the pursuit for small form factor, flexibility and functionality comes Seeeduino Mega – derived from Arduino Mega it harnesses the power of ATmega2560 to spice up your project building experience.

Features

ATmega 2560 @ 16MHz

Selectable 5V/3.3V operation

70 Digital IO

16 Analog inputs

14 PWM outputs

4 Hardware serial ports (UART)

Compatible with most Arduino Duemilanove and Diecimila Shields

Small form factor, 30% smaller than Arduino Mega

Easy to program, no additional hardware is required to load firmware – just plug to a USB port and you’re good to go.

ICSP Header

Can be powered through a battery or through a AC to DC adaptor