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This product is a carrier plate with microstepping driver with overcurrent protection. This version has four layers. The module has a pinout and interface almost identical to the stepper motor driver A4988. When installing the RAMPS or Rumba necessarily view this it is installed correctly. Ready to control whether the pin names match. Otherwise, the whole electronics go defective.

Features:

Short overload protection
Adjustable current control
Overtemperature protection, overtemperature shutdown
Step and direction control interface
1/1, 1/2, 1/4, 1/8, 1/16, 1/32 step
Rs ohm 0.10

Setting the driving voltage:

Amper of motor x 0.7 / 2 V
As an example
Nema 17 1.2A Motor x 0.7 / 2 = 0.420V