This training collar works great. I love that it’s easily recharged and the battery seems to last 3-4 weeks. I like that it’s a progressive system, tone, vibrate, shock. The shock function is no joke...I tried it myself on level 1. I’m not sure level 99 is needed and is probably too much for a dog. Make sure you use the lock function, my kids have accidentally triggered the shock when carrying the controller in my pocket.