This is for one power module for controlling 3D printer heated bed, it is also can be used to drive other non-inductive loads. If you plan to use silicone heater of large area heated bed, you most likely will overcome limitations for the current, that can handle your current 3d printer electronics. This control board will handle high current without even getting warm. Oversize MOSFET and overall very robust PCB design will allow for trouble free operation without active cooling.
Heated bed power module features: