Seeed Studio Seeeduino Mega

Seeed Studio Seeeduino Mega is a powerful microcontroller derived from Arduino Mega and features an ATmega2560 processor which brings a large number of I/O pins. The Mega has as much as 70 digital I/O, 16 analog inputs, 14 PWM, and 4 hardware serial ports. The Seeeduino Mega has 30% less volume than the Arduino Mega and is 100% compatible with Seeed Shield products. The Seeeduino Mega inherits deliberate details from Seeeduino, like selectable operating voltage (3.3V/5V), right angle reset button, and so on.

Features

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