Works great! I do not shock my dog. i think that is mean but i got this for the buzzer/vibration. Worked like a charm. Snapped my dog right to my attention every time. I did not have to use it hat often. After a few buzzes my dog knew that just hold up the remote was enough. The buzz and vibration are soft. It fits my Saint Bernard so it good for big dogs. Most collars are hard to find for dogs of this size. The only reason im not giving 5 stars is the control buttons. at night is a little hard to find the right buttons for the vibration. A few times i accidentally zapped my poor pup when i just wanted to give him a little buzz. So just takes a bit of mental memorizing of the buttons. light works good, just not to strong, Battery life is great but a little tricky to get to the charging port. have to remove the collar to get to the port. But for the money... Good to go.