Mega 2560 ATmega2560-16AU Board w/USB Cable.

The Mega 2560 board is a microcontroller board based on the ATmega2560, 100% compatible with Arduino Mega 2560 and most shields designed for the Mega 2560, Uno, Duemilanove, or Diecimila. This upgraded 3.1 version mega R3 board features an Atmega 16U2 chip which replaces the 8U2 and has a stronger RESET circuit.

The Mega 2560 board comes preprogrammed with a bootloader that allows you to upload new code to it without the use of an external hardware programmer, and can be programmed with the Arduino Software (IDE). The ATmega2560 has 256 KB of flash memory for storing code (of which 8 KB is used for the bootloader), 8 KB of SRAM, and 4 KB of EEPROM (which can be read, and written with the EEPROM library). Board can be powered via a USB connection or with an external power supply.

Specs:
Model: Mega ADK R3
Material: PCB board
Controller: ATmega2560
Working voltage: 5V
Input voltage: 7~12V
Limit voltage: 6~15V
Digital ports: 54 (14 PWM output ports)
Analog ports: 16
IO port output current: 40mA
3.3V power supply output current: 100mA
Flash: 256 KB of which 8 KB used by boot loader
SRAM: 8KB
EEPROM: 4KB
Crystal: 16MHz

Included.
1 x Mega 2560 ATmega2560-16AU Board
1 x USB cable