Product Specs and Pakcing:(1) Mega 2560 R3(2) 3D Printer Controller RAMPS 1.4 It is designed to fit the entire electronics needed for a RepRap in one small package for low cost. RAMPS interfaces an Arduino-compatible Mega with the powerful Arduino-compatible MEGA platform and has plenty room for expansion. The modular design includes plug in stepper drivers and extruder control electronics on an Arduino-compatible MEGA shield for easy service， part replacement， upgrade-ability and expansion.(3) A4988 Stepper Motor DriverA4988 is a complete microstepping motor driver with built-in translator for easy operation(4) LCD 12864 Graphic Smart Display ControllerThis full graphic Smart Controller contains a SD-Card reader， an rotary encoder and a 128 x 64 dot matrix LCD display. You can easy connect it to your Ramps board using the "smart adapter" included.Package List(1) RAMPS 1.4 x 1(2) Mega 2560 R3 x 1(3) A4988 Stepper Motor Driver with Heatsink x 5(4) LCD 12864 Graphic Smart Display Controller x 1(5) Smart Adapter x 1(6) Cable x 2(7) USB Cable x 1