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Powerful enough to charge up to 30 miles of wire in a virtually indestructible, watertight plastic case. Light flashes to indicate when the fence is working, so fence can be easily maintained. Works even in heavy weed conditions (but best when fence is kept clean). UL and Canadian approved low impedance fencer works on 110 volt and has a 3 joule stored rating and a 1.8 joule output.