I bought this dual package for my neighbor 4 doors away. They have 3 little dogs and OMG when she let’s them outside it’s a cacophony of barking. I think they just bark bc they want to. My dogs just watch them now. They just bark at anything and everything the entire time they’re in the backyard. Sometimes people don’t hear their beloved pet/s and realize that they’re such a disturbance to others.I just took the dual bark collars down and put it in their mailbox at about midnight. Stealthily, I might add!But, I will say it has been quieter recently. I hope they weren’t too upset with the gift. But, someone was eventually going to call the Dog Police on them and not only would they get a warning for the barking, they’d get a hefty ticket for not having a city dog license. (I don’t know that they did or didn’t have a City License, but I’m sure they didn’t. In this neck of woods unless one has had a complaint, most people don’t do the licensing. It’s expensive and with three dogs??? It’d be enough to not want to pay it yearly!)The collars come in a nice sturdy box and the collars looked real nice sitting inside the box. A great gift for someone. And, a great gift for me too. It seems as though they are using them.Definitely worth the 50$ for a little peace.Actually, I could have used them at my house. I have one dog that tends to be a little barker at times and the collar I have is quite old. I was thinking of buying two sets and keeping one of the collars. I only gifted them two collars and they have three little dogs. But, everything seems to be copacetic for the time being!