subject: Automotive aromatherapy diffuser,electric diffusers [print this page] The first electrode control has an internal end that is connected to an internal electrode by an elongated conductive spring. Power is conveyed through the electrodes and the spring to energize several safe electrical control components within the housing to provide heat at varying temperatures to a fragrance laden pad and to operate the fragrance emitting phenomenon. A cover is connected to the electric diffusers and surrounds the pad to protect against injury.