My daughter saw this somewhere and thought it might be a friendly solution to an annoying neighborhood barking dog.
Huh! I don't think this one does. I believe it just makes a hiss like the "Ssscat Spray"...
Bark collars are shock collars. They don't vibrate (there are a VERY small minority of remote collars that have an actual vibrate function - those are different), they apply an electric shock when the dog does a certain behavior. So they don't just hurt, they also tell the dog it isn't allowed to communicate.