I'm online now to buy my third one of these collars (fourth if you count the one given by a friend). The upside: the collar really works for my dog. I tried all sorts of other training methods (other than shocks) that didn't work. This collar stops him at one bark, if that. The downside: the collars just don't last, not even a year. If Premier would put a warranty on this item, they would find that they needed to invest a little in the quality of the product. They simply stop spraying after a while, even with a brand new battery and a refill. Normally I would not continue to buy an item with such low quality, but I'm addicted to a nice quiet house now, so I keep coming back. Expect about a 9-month product life, and that's if you NEVER forget and leave the unit on overnight!