Effective pet training requires consistency. The PetSafe® Bark Control Collar automatically and consistently corrects excessive barking in dogs. When the vibration of your dog's bark triggers the sensor probe, a safe but annoying static stimulation is administered through the contact points. The Bark Control Collar starts with the lowest level of stimulation and then increases through 6 levels each time your dog barks within 30 seconds of the previous bark. Read on to learn more.