I have a one year old pitbull mixed who barks at a knock or loud noise. I have tried many things to get his attention when he’s barking but nothing worked. I tried a different brand and he didn’t respond to the sound, vibration or even the shock. I gave up on training colors but recently decided to give it another try. He’s had this on a few times and it really works! The sound is loud enough that he hears it when he stays barking, the vibration is strong and I haven’t had to shock him. This collar has also made walking him on a leash sooo much easierThe battery life has been great so far. I really like that the battery life of the collars and the remote control is displayed on the controller