I have a 180lb St Bernard that is stubborn and bullheaded. Just the beep will stop her in her tracks now. This is a life saver!! I never thought I was going to get this dog trained. But this is a miracle worker!! And the battery life is amazing!! I don’t have anything bad to say about this collar! I have tried many other collars on our German short hair and they never worked on her. She always managed to wiggle out of them. This came with an extra and she can’t get out if it. It even worked on her!! I love it!!