Though only a 5.5 joule unit, even at low setting, the joules that it actually delivers to the point of animal contact greatly exceeds that of much larger units when the total fence circuit resistance is high. This is a direct result of the unusual circuit design. It is my estimation that, even at low setting, this unit has about five times more energizer energy output available than is needed in most instances. That is always better than the opposite situation, however. A word on the subject of voltage for electric fences.
Few things seem to be so misunderstood by so many.
It is not the voltage that deters an animal. But the energy available in static electricity is minute. Thus only minute pain is felt. The energy that flows is not proportionate to the voltage of a circuit. Without adequate voltage, no energy will flow.