The PE2 electric fence energizer is a 110 volt a/c plug in 0.10 joule model that is ideal for containment of livestock, poultry .corralled while preventing predators from accessing your land. PE2 Output Voltage: Up to 5 kV max, 2.8 kV @ 500 ohms; The ground system should be at least 33' (10 m) away from electric or telephone ground systems to avoid interference. Visible light indicates whether it is working. Equipped with two terminals, a ground (green) terminal for connecting to a separate ground rod, and a fence (red) terminal for connecting to the fence line. Make sure there are a sufficient number of ground rods. If in doubt, use at least three ground rods. Use more ground rods if your soil conditions are not ideal. Ground rods should be at least 6'6" (2 m) long. One long ground rod works better than several short ground rods.