The Bark Controller consists of a special receiver which fits on a collar around the dog's neck and works with a battery. When the dog barks an audible warning is given by the receiver , if this is ignored, the dog receives a correction similar to a static electricity experienced from a car door or lift button. It is entirely harmless, but it is unpleasant and the dog will not wish for it to be repeated. Once the dog has not barked for approximately 20 seconds the unit will reset itself again to give the warning prior to correction.