Fiddo No Bark Collar Shock Control Training System w/7 Adjustable Stimulation Levels (Manual included) Train your dog not to bark with the most humane, cost-effective, and harmless method on the market. Features 7 levels of correction, with increasing intervals of harmless warning sounds and shock stimulated by your dog's bark. Stimulus pauses programmed to prevent over stimulation. Perfect for dogs between 15-120 lbs. Includes receiver, 6V battery, and operating manual. Not designed to correct extreme canine aggression. Unhappy with your purchase in any way or have any questions? Email us via Buyer messages!