Our goal is to provide the most power for the dollar and best value for the money. This product certainly fits that criteria. If you are looking for the best value of power for the dollar plus reliability and without all the extra bells and whistles, then this is the energizer for you. However, we only have a limited number of these energizers to sell and they cannot be restocked at this price. We have a limit of two per customer. They carry a three-year warranty, including damage caused by lightning. This unit includes a storm guard which 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.