This DRV8825 stepper motor driver module is an upgraded version of A4988 simple step and direction control interface, it is an upgraded version of A4988, 4-layer PCB to improve heat dissipation and reduce chip resistance The adjustable current control allows you to set the maximum current output using a potentiometer, this allows you to use a voltage higher than the rated voltage of the stepper motor for higher step rates, it uses 8.2 - 45 V and can provide up to 1.5 No heatsink or forced airflow (rated up to 2.2 per volume for adequate additional cooling) Stepper motor driver (soldering head pin soldering) is a breakout board for DRV8825 microstep bipolar stepper motor driver, intelligent chopper control automatically selects the correct current decay mode (fast decay or slow decay), built-in voltage regulator (requires any external logic supply voltage) The module has pinouts that can be used as a better performing drop-down menu board replacement in many applications, operates from 8.2V to 45V, and can deliver up to approximately 1.5A per phase. It comes with a 0.1"-pitch male pin mount DRV8825 features adjustable current limit, over-current and over-temperature protection, six micro resolutions (1/32 step down), six different step resolutions: full step, half step, 1/4 step, 1/8 step, 1/16 step and 1/32 step