Harmless No Bark Dog Training Collars Anti Bark Control With 7 Levels Button Adjustable Sensitivity Control Tone/vibration/shock For 15-120 Pounds Dogs NEWLY LAUNCHED VERSION ON SALE - Petiner Bark collars sends harmless warning shocks, progressing through the 7 sensitivity levels 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. EASY TO USE - As soon as your No Bark Collar arrives,Simply slip it around your dog's neck and the system will work automatically . EASY ADJUSTABLE SENSITIVITY LEVEL - 7 levels adjustable for different size of dogs barking and specific environments through the "+" /"-" button. FITS MOST BREEDS - From Beagles to Dobermans and almost virtually any dog in between, To help guarantee the safety and comfort of your pet, we generally recommend the collar for dogs ranging from 15- 120 lbs