All dogs bark, but some don't know when to stop. If your dog's barking is becoming a nuisance, this may be the solution you're looking for. 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. If your dog does not bark again within 30 seconds, the Bark Control Collar resets itself to the lowest level of stimulation. Along with each static stimulation, there will be an audible beep. For safety, the Bark Control Collar shuts off for 3 minutes if your dog barks 15 times or more within 50 seconds. No Shock" caps are included so that the collar can be used as a dummy during the initial stages of training, but have the exact weight and sound of the real collar. For dogs 3.6 kg and up, it fits neck sizes up to 71 cm, is waterproof, and uses 1 x 6 Volt battery (included) that should last 3-6 months. It includes a low battery indicator.