With theZareba(R) 25 Mile AC Powered Charger, you can deliver 1.0 Joules of energy across medium-length fences around your property. This Built in the USA energizer offers low impedance technology that electrifies fences up to 25 miles long. This energizer is wrapped in a rugged, heavy-duty case that includes an indicator light to alert you when your energizer is up and running. | ZEREBA Energizer 25 Mile