Our goal is to provide the most power for the dollar and best value for the money. For that reason, we have added two Zarebra energizers to our line. If you are looking for the best value of power for the dollar plus reliability and without all the extra bells and whistles, then here is the energizer for you. They are made in the USA and carry a 3-year warranty! Zareba 15 with 15-Joule Output & 3-year warranty The Zareba 15 is the most powerful American-made charger available. This unit includes a three-year warranty, including damage caused by lightning. A storm guard comes free with the charger and is required to be operational for the lightning warranty to be in effect. It is AC-powered, low-impedance, 15-joule output at 75 ohms; 20 stored joules, 115 volt, and 60-cycle, pulsed output (1-second intervals). It has digital timing and a no fuse requirement design. The fence lamp flashes when operating. The unit is contained in a vented, weather-resistant nonconductive cabinet and includes Storm Guard lightning protection.