This 4 joule, multi purpose fence energizer can be plugged in, used with a 12v battery and/or solar panel. Powers up to 60 miles / 280 acres of clean fence and offers uncompromising performance. Features low impedance that will shock through weeds and brush. Clean Fence:60 miles / 280 acres Typical Fence:20 miles / 120 acres 4 Stored Joules