A DMOS transistor in which a main current flows between first and second main surfaces of a silicon substrate is formed. A first lead finger has a lower portion, a connecting portion extending vertically upward from the lower portion, and a substantially flat, top portion. The biosensor may be a \u201cfluoroptical\u201d system wherein the detection tag is a fluorescence emitting substance, including fluorescent-labeled diffraction enhancing elements. A method comprises filling the interior volume with a liquid scent so that the interior volume also includes a volume of air, suspending the dispenser over a ground surface, and dispensing the liquid scent from the interior volume through the release structure.