The Premier Pet Bark Collar quickly discourages nuisance barking. If your dog barks the collar detects your dog s bark and issues tone vibration and static correction. This correction will not be triggered by the bark of any dog except the one wearing the collar. A low battery indicator on the collar will alert you when the collar battery should be replaced. Live peacefully together with your dog small or large by discouraging barking when using the Premier Pet Digital Bark Collar!