This product served its purposeI love this.

After we put the collars on I was amazed at how quickly the barking subsided.

I'm sure it won't work so well on every dog but it is money well spent.

I only put it on when someone is coming, and I put it on the lowest setting.Worked for my yelping pet

She now will try to avoid the things that stimulate her to bark.If she ever starts the superfluous barking, we simply put it back on.

It starts off with a light vibration (lets the dog know, ummm better not bark again), if the dog barks again, goes up another level.