This listing is for an Arduino Mega 2560 Revision 3. with 1 USB cable included , so you can start your arduino test right away as soon as you recieve it.
Compared with Arduino UNO R3 , this is with main Chip ATmega2560 , with more I/O Pins, and additional 10 PWM output , of course , the EEPROM is also with larger space.
Arduino MEGA 2560 R3 Pinout Diagram
Package list includes
Arduino MEGA 2560 R3 board x 1
USB cable for arduino MEGA 2560 R3 x 1