FYI i installed a electric fence on my coop 6 inches from ground ,because of cats and dog messing with chickens . after installed one day i heard noise at coop area and look outside and there was that cat walking around the coop he got to close and the fence bit him and you would of thought that he stepped on a land mine ,jump 3 ft in air and run off ,then the dog showed up that night same thing heard noise and look that dog he was a little more brave chasing chicks around the coop run and all the sudden bam he got it . so he ran around the other side and tried it again and bam he got it again . so i have not seen the cat or dog again which is what i wanted to protect my girls . ps i'm running 3 joules on the charger which is a good pop. the charger was 19.99 at farm store .