Arduino Mega 2560 is the latest version of the development board and the successor to Arduino UNO. This board has the same clock speed as the Arduino Uno, but is a real powerhouse because of the much larger memory and more than doubled number of pins.

This Arduino is very popular and is very easy to program due to the built-in USB interface. With the Arduino development software you already have your first program running within minutes.

It concerns the 3rd revision (newest) with the following adjustments:
Atmega 16U2 replaces 8U2.
Stronger RESET circuit.
Added SDA and SCL pins at the AREF pin and 2 new pins at the RESET pin, namely the IOREF pin, allowing shields to adjust to the voltage from the board. In the future, shields are compatible with both the 5v and 3.3v versions. The 2nd pin is not connected and is reserved for future updates.

This arduino is a clone, which means that this sign is not built in the original factory. The only difference between original and clones is that these Arduinos are cheaper. All components and circuits are otherwise identical.
 
PROPERTIES
Power
5 V
Input voltage 
7 V - 12 V
Flash memory 
256 KB
Digital I/O 
54
PWM 
15
Stroom per I/O 
20 mA
Microcontroller 
ATmega2560
Clock speed 
16 MHz
EEPROM 
4 KB
SRAM 
8 KB
Analoog I / O 
16