1.Small package large capacity: The RAMPS 1.4 board is designed to fit the entire electronics needed for a RepRap in one small package for low cost,interfaces an Mega with the powerful MEGA platform and has plenty room for expansion. 2.Modular design: The modular design includes plug in stepper drivers and extruder control electronics on an MEGA shield for easy service, part replacement, upgrade-ability and expansion. 3.Docking Mega platform: Mega is an ATmega2560 as core micro-controller development board itself has 54 groups digital I / O input / output terminal (14 groups do PWM outputs), 16 sets of simulation than the input side, group 4 UARTs (hardware serial ports), using the 16 MHz crystal oscillator. 4.USB direct download: With the boot-loader, download the program directly via USB without having to go through other external writer. 5.Overcurrent protection: A4988 driver is a carrier board or breakout board for Allegro's A4988 DMOS micro-stepping driver with translator and Over current Protection by Pololu.