Petiner Harmless No Bark Dog Training Collars Anti Bark Control Collar With 7 Levels Button Adjustable Sensitivity Control Tone/vibration/shock [New Model] NEWLY LAUNCHED VERSION - Petiner New Model Bark Collar were improved in sensibility and service lifetime. It will more easily catch your dogs' barking, as well as works for a longer service lifetime. 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