The Mega 2560 CH340 improvement version is an update for the Arduino Mega, which it replaces.

The board is a microcontroller board based on the ATmega2560-16AU .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. 

Product Summary:

• CH340G replace the Atmega 8U2/16U2
• CH340 Driver .
Driver for Windows 7

Specifications:

• Microcontroller: ATmega2560
• Clock Speed: 16 MHz
• EEPROM: 4 KB
• SRAM: 8 KB
• Flash Memory: 256 KB of which 8 KB used by bootloader
• Operating Voltage: 5V
• Input Voltage (recommended): 7-12V
• Analog Input Pins: 16
• Digital I/O Pins: 54 (of which 14 provide PWM output)
• DC Current for 3.3V Pin: 50 mA
• DC Current per I/O Pin: 40 mA
• Size: 100*55mm

Package Included:

• 1 x Arduino Compatible Atmega2560-16AU CH340G ATMEGA 2560 R3 Board Mega2560 R3
• 1 X USB Cables