This Gallagher energizer powers up to 110 miles / 650 acres of clean fence. Crafted from a rugged combination of tough, high impact plastic for its outer casing and a build in lightning diverter with the latest internal circuitry - this energizer is designed to last. The added power reserve in this unit has built-in technology that increases voltage output when fence conditions change. | Gallagher Fence Energizer M1100