Dogtra No Bark Collar

Purchased two collars for our two small dogs. First time each one of them barked was a surprise to them and to me! We started on just the vibrate mode and moved to the lowest setting of "2" which is enough to get their attention. As they wear the units they do not bark at the usual triggers, but with a door bell ring or a knock on the door, they still have the urge to bark (at least once) then comes the correction and they are silent once again. They seem to know, now, that when the collars are on they shouldn't bark. That didn't take but a few barks for them to figure out! One item that was a concern with two units is that if one dog barked and the other was close by their collar also did a correction. (Sad for the one not barking, but only happened durning the initial introduction of the product.) Good tool to train your pet, but please make sure to verbally correct your pet at each bark as well. This will help you when the collar is not being used. I would recommend this product to anyone who has a barking dog issue.