RAMPS 1.4 Set/Kit For RepRap Mega 2560 R3,5*A4988, 12864 LCD Arduino
5 A4988 drivers with heat sinks. Clock Speed:16MHz. Short circuit to ground short circuit protection. Digital I/O pins:54(14 of which provide PWM outputs). DC current per I/O pin:40mA. DC current at 3.3V pins:50mA.