Educator BarkLess No Bark E-Collar Bark Collar Low-current stimulation humanely condition dogs not to nuisance bark By setting stimulation to the correct level, protection barking will continue while unnecessary barking is eliminated Auto-mode feature senses barking habits and automatically increases stimulation until barking has subsided for 10 minutes Unique technology provides very clean stimulation without the head jerking often found with imported bark collars 100-Percent Satisfaction guaranteed