This thing is intense, I accidentally shocked myself on 55 and felt it in my throat so I put it on a lower setting (5) for my 65 pound dog and it has worked wonders! We have only had to shock him twice because he responds to to beep now. We got it because he is really bad about play biting but hard and ever since we got it we havent had to worry about him biting. We have had it for a few weeks now and I have only had to charge it when I opened it. The battery life is awesome on it!