Awesome product. The dogs know exactly where the edge of our rural property is. It has fences that the average staffy would laugh at. I was worried about them crossing the line And getting confused when we go for walks but they have totally got the concept that harnesses on mean the dog line “isn’t working”😉 We have also saved the outdoor furniture from Dozer who likes to use table and chair legs as chew toys and stopped them sleeping on top of my plants in the garden beds. It also saved our dogs lives as they were getting over the pool fence and running across the pool cover, it’s now got a run of wire around it.