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The R4211 control board is compatible with the Mighty Mule FM500/502, MM560/562 and MM600/660. This control board is a durable, flexible replacement for the circuit board in any of these gate openers. The R4211 control board is capable of handling single and dual gate installations. All Mighty Mule accessories will work with this board. The R4211 is a replacement control board for the FM500/502 and MM560/562. Built to support all Mighty Mule accessories. The R4211 can handle push and pull-to-open settings, dual gate operation, and you can use direct power from a solar panel or from an AC transformer. Not compatible with the Mighty Mule FM200, MM260, FM350/352 and MM360 automatic gate openers. Backed by a 12 month limited warranty