A4988, Drv8825 Stepper Motor Driver Heat Sink With Sticker. Features: 1. Simple Step and Direction Control Interface 2. Six Different Step Resolutions: Full-step, Half-step, 1/4-step, 1/8-step, 1/16-step, and 1/32-step 3. Can Interface Directly with 3.3 V and 5 V Systems 4. Over-temperature Thermal Shutdown, Over-current Shutdown, and Under-voltage Lockout 5. Short-to-ground and Shorted-load Protection 6. 4-layer, 2 Oz Copper PCB for Improved Heat Dissipation 7. Exposed Solderable Ground Pad Below the Driver IC on the Bottom of the PCB 8. Module Size, Pinout, and Interface Match Those of Our A4988 Stepper Motor Driver Carriers in Most Respects (see the Bottom of This Page for More Information) 9. Adjustable Current Control Lets You Set the Maximum Current Output with a Potentiometer, Which Lets You Use Voltages Above Your Stepper Motors Rated Voltage to Achieve Higher Step Rates 10. Intelligent Chopping Control That Automatically Selects the Correct Current Decay Mode (fast Decay or Slow Decay) 11. 45 V Maximum Supply Voltage 12. Built-in Regulator (no External Logic Voltage Supply Needed) Specifications: Motor Type: Stepper Motor Power Supply: DC Package Included: 1xStepper Motor . We are an international based seller that will ship your order from abroad, please at least a minimum 14 working days for delivery right now due to the ongoing delays in shipments globally.