Methods and apparatus for improving word-of-mouth online advertising are provided. The hand held device includes a charging device for producing a high voltage charging field and a spray nozzle having an outlet, the outlet being disposed within the charging field. The second valve seat being borne by a first longitudinal end of a plunger distributor while the first valve seat is borne by a first longitudinal end of a bushing slideably mounted in a sealed manner in the pneumatic piston over a defined first travel and beyond the defined travel the bushing is secured axially to the pneumatic piston.