Bests & Worsts Reviews from Amazon

I purchased 4 of these collars. Unfortunately one of them failed to advance to the "vibrate" mode after the allotted time for returning it had just passed. The beeps were also quieter than the other collars. The volume button did not work. So apparently that 1 collar was a dud. The collars do seem to work. Depending on the dog the 2nd beep usually deters the barking. My larger dog will sometimes bark until the 1st vibration and then stop. Or old mini dachshund was the worst at barking. The collar has worked esoecially well on him. It's funny because the first time any of our dogs experienced the vibration they looked around like "What the heck just happened!!!" My daughter came home from college with her 1 yr old dog. Beep/vibration did not deter her. We ended up getting a shock collar and put it on the lowest setting. We felt horrible using it but it stopped her right away. We don't even need to use it anymore. So I would recommend this humane method to deter unnecessary barking. I would love it if the company would replace the dud collar. If so I will follow up with an update. UPDATE: I sent a message to the seller and they responded immediately! They are sending me out a replacement collar. Great customer service!