The Elite Big Dog Bark Control Collar detects your dog's bark using patented Perfect BarkTM technology to ensure only your dog's bark causes the correction. As he barks, he receives a safe but annoying static correction. The bark collar begins with low corrections, and if barking continues the correction intensity will increase. When used correctly, the bark collar reduces (and in most cases eliminates) nuisance barking. Your dog will quickly learn the association and stop the unwanted behavior.