The Deluxe Big Dog Bark Control Collar detects your dogs bark using Patented Perfect Bark™ 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, if excessive barking continues the correction intensity will increase. When used correctly the bark collar reduces (and in most cases eliminates) the number of nuisance barks. Your dog will quickly learn the association and stop the unwanted behavior.