This product is a 3D printer accessory DR8825 stepper motor driver, which can drive stepper
motors below 8.2V-45V 2.5A. It only has a simple stepper and direction control interface, and
has six different stepper modes: full, half, 1/4, 18, 1/16, 1/32. There is also an adjustable
potentiometer to adjust the current output, thereby achieving higher stepper rates.
It has automatic current decay mode detection/selection.