A wireless device is configured with a primary cell group and a secondary cell group. The transport container is sized to accommodate a plurality of individual premeasured charges of gunpowder. It also comprises a step for determining the intermediate impulse response associated with the fictitious probe or probes and the combination of said intermediate impulse responses. The gap distance is adjusted to tune the vertical cavity surface emitting laser around its center wavelength by applying a voltage across the piezo-electric submount which causes mechanical stress therein. The corresponding set of constants represent a corresponding set of amplitudes.