LuWees No Bark Dog Training Collar Harmless Dog Shock Collar With 7 Levels Button Adjustable Sensitivity Control,Stimulation of No Harm Warning Beep and Shock for 15-120 lb Dogs HUMANE AND EFFECTIVE - Stops unwanted barking with progressively increasing warning sounds and harmless static stimulus,repeat through 7 correction levels,For your dog's protection, it will stop working for 1 minute should your dog continue to bark SMALL COMFORTABLE LIGHTWEIGHT - Best bark collar for small dogs. Also use as anti barking device for large dogs. Sits comfortably at front of neck. Strong durable woven collar and lightweight controller make the dog training collars comfortable to wear. EASY ADJUSTABLE SENSITIVITY LEVEL - 7 levels adjustable for different size of dogs barking and specific environments through the "+" /"-" button BLACK NYLON WEB COLLAR-can be adjustable to fit any breed of dog weighing 15-120 lb dogs