Description Parameters: Size: 1.5mmX2mm (for RAMPS, ultimaker or other compatible boards); The drive current: 2A (best to install the heat sink) Segments: 1,1 / 2,1 / 4,1 / 8,1 / 16 Manufacturing process: higher SMT placement machine manufacturing, non-manual welding, yield, more stable performance. Applications: Stepper motors /3D printer/CNC/engraving machines/Supported 3d printers like Prusa Mendel, ultimaker, printbot, makerbot and so on.You can refer to the Arduino code at the back of the module. Package included: 1*A4988 Stepstick Stepper Motor Driver Module (with PINs) 1*Heatsink