The Mighty Mule MM372W or MM572W gate opener replacement Limit/position sensor board is a crucial component for maintaining the functionality of your garage door. Specifically designed for Mighty Mule products, this circuit/logic board operates at a voltage of 12V and comes in a package quantity of 2 units. This sensor board replaces the OEM sensor board which the company does not sell.  If you do not want to buy two arms for your gate to fix just this board problem, then these are what you need.  These boards are NOT OEM but built and tested by me.  The board does fit and replace the originals.  Works in the MM 371W as well.