5pcs A4988 Stepper Motor Driver pololu StepStick Module Board Red with Aluminum Heat Sink Compatible with ramps 1.4 3D Printer Reprap, CNC Machine or Robotics

Description Features: -Intelligent chopping control that automatically selects the correct current decay mode (fast decay or slow decay) -Over-temperature thermal shutdown, under-voltage lockout, and crossover-current protection -Automatic current decay mode detection / selection -Internal UVLO -Mixed with slow current decay modes -Synchronous rectification for low power dissipation -Crossover-current protection -Thermal shutdown circuitry -3.3 and 5 V compatible logic supply -Thermal shutdown circuitry -Ground Fault Circuit -Load short-circuit protection Of five optional step mode: full, 1/2, 1/4, 1/8 and 1/16 Package Included: 5*A4988 StepStick Stepper Motor Diver Module 5*Heat Sink