They hate me because these collars work! I received a complaint about my dogs' barking recently and had to resort to buying these. The collars give options for just a sound alert, vibration alert, or a shock alert. All I had to use was sound, and you'd think I had severely punished them. They hid from me all day long, making sure I knew they were upset with me. But even when I walked them after taking the collars off, they at least remembered that something negative would happen if they bark. I just received them two days ago, and not enough time has passed to really get a feel for the full effect, but so far I LOVE these.