Description: Suitable for driving 8 V ~ 35 V 2 A following the stepper motor. Only simple step and direction control interface, five different stepping modes: full, half, 1/4, 1/8 and 1/16. Adjustable potentiometers can adjust the maximum current output, resulting in a higher step rate. Automatic current decay mode detection / selection. Overheat shutdown circuit, undervoltage lockout, cross current protection, ground short circuit protection and load short circuit protection. Specification: Material: PCB board material Size: 15mmX20mm (for RAMPS, ultimaker or other compatible board) Can drive current: 2A (the best installation of heat sink, will be attached to the heat sink, you need to install) Segment: 16 breakdown Machine patch production, PCB copper 2oz (copper thickness of 70um, ordinary is 35um), high copper content, good heat dissipation. Arduino 2560 CPU core board Ramps1.4 main control board A4988 driver board stepper motor drive module (single 4, double 5) LCD LCD controller can be LCD LCD control, SD card is offline (optional) or other compatible motherboard Package Includes: 1x A4988 driver board(2 Pack) 1x heat sink(2 Pack)