This Product is discontinued Now, you could choose some other arduino microcontontroller boards such as DFRduino Uno, arduino uno R3, arduino M0 pro, Arduino M0 Board, Arduino Mega 2560 Rev3.
The Arduino Mega is a arduino microcontroller board based on the ATmega1280. It has 54 digital input/output pins (of which 14 can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started. The Mega is compatible with most shields designed for the Arduino Duemilanove or Diecimila.