The R4211 is a replacement control board for the FM500/FM502, SW2500/2550, SW3000/3200XL, SW4000/4200XL series swing gate openers * Built to support all GTO/Mighty Mule accessories * Can handle push and pull-to-open settings and dual gate operation and can direct power from a solar panel or from an AC transformer * Is an ideal replacement control board if a previous board was burned out by a lightning strike, a power surge or if the previous board was burned out by reversed battery wiring