Electric fence chargers are designed to create an electrical shock when touched by a person or animal. The charger converts power into a brief high-voltage pulse. Electric fence chargers have one terminal of the charger to release the electrical pulse along a connected bare wire about once per second. Another terminal is connected to a metal rod implanted in the earth, called a ground rod. An adequate ground (rod six feet deep, or two grounded together if used in dry conditions) is an absolute must. A person or animal touching the wire and the earth simultaneously will complete an electrical circuit and will conduct the pulse, causing a painful electric shock. Electric fence chargers depend upon the voltage and electrical current used, and can range from barely noticeable to painful. This electric fence charger energizes up to 20 miles and can be considered painful. 105-125VAC, 50/60HZ indoor use or outdoors with a protective cover. Charger helps control tall weeds and grass. 2 year limited parts and 1 year limited warranty against lightning.