This Patriot fence charger powers up to 2 miles (8 acres) of live wire. Suited to use in strip grazing or protecting remote areas where regular access is inconvenient. The PS5 can help protect erosion areas from further stock damage or prevent livestock from damaging young trees or riverbanks. It has a 2W solar panel and 4v battery included. Two year warranty applies. Up to .05 joules maxiumum energy output.