This is a 5V microcontroller running a version of the stk500v2 bootloader at 16MHz.
Just like the other Pro-series boards this board is built with all SMD components and comes with no headers populated in order to minimize the cost and the board profile.
Of course this board has the same pin-configuration as the Arduino Mega, so it is dimensionally shield compatible.

The Pro series is meant for users that understand the limitations of system voltage (5V), lack of connectors, and USB off board. This board connects directly to the FTDI Basic Breakout board and supports auto-reset and the DC power jack footprint is available, but not populated.

Note: When using this board in the Arduino IDE, select 'mega2560'. This board also works with the Wiring IDE. You will need to download the board definition files in the documents section below.

Features:

• ATmega2560 running at 16MHz external resonator
• USB connection off board
• 5V regulator, 200mA continuous (500mA peak)
• Over current protected
• Reverse polarity protected
• DC input 5V up to 12V
• Resettable fuse prevents damage to board in case of short
• Power select switch acts as on/off switch

Documents:

• Schematic
• Eagle Files
• Datasheet (ATMEGA2560-16AU)
• Board Definition Files (Wiring 1.0)