Features : • Atmel AT90USB1286 Microcontroller.
• Four integrated Allegro A4982 Stepper Drivers.
• Four 5V Endstop Connectors Supplied.
• OnBoard SD Card Slot.
• 2 N-MOSFETs for Extruder and HeatBed control.
• 1 N-MOSFET for low power Fan or motor.
• Revision D.
• Green Power LED.
• 4 layer, 2oz Cu PCB with ENIG Finish -- Excellent current handling & thermal dissipation.
• LUFA CDC Bootloader and Marlin RC2 firmware Pre-Installed.
• Offers additional 14 Pin Headers for Expansion and Developement.