The Power Wizard 9 Joule Plug-In Electric Fence Energizer controls up to 900 acres or 150 miles of fence wire under conditions with moderate to heavy vegetation. This livestock electric fence energizer comes with heavy-duty wire knobs with metal inserts to prevent stripping and features Ultra Low Impedance technology. Suitable for horses, cattle, pigs, sheep, deer and exotics, this Power Wizard electric fence energizer quickly connects to most new or existing fence lines to provide 24/7 protection. Its plastic construction offers enhanced durability. This energizer also comes backed by a 1 year limited warranty for purchasing assurance.