This was just barely enough to get around my entire property perimeter. My 75 pound golden retriever seems to respond well on a 2 or 3 setting. I am using this product to save my wood fence that my dog was attacking due to some annoying little yapper dogs next door. I was replacing fence boards left and right. This has also slowed down the barking at the neighbors dogs as the barking and attacking of the fence were associated actions! Easy to install!