Equipped with dual bark detection technology, the Finn & Winston No Bark Collar allows for more accuracy and consistency in dog bark control. As an alternative to spray and shock collars, anti-bark vibration collars send vibrations that signal the dog to control dog barks. Effective in reducing or eliminating nuisance barking with careful and proper training, the No Bark Collar can help dogs learn how to stop barking without the participation of their owners or trainers. The vibration dog-training collar is adjustable, and can be used to help control barking with 8 levels of vibration, on small, medium or large dogs. Train your dog easily and harmlessly, and humanely with the Finn & Winston No Bark Collar.