Abstract: A system and method for use in matching a source to a dynamic impedance electrical load is described. The system may include a processor that controls a signal generator to sweep across a frequency spectrum to locate a resonant frequency of the dynamic impedance load. The determination of resonant frequency may be made based on sensing the power consumption of the amplifier supplying the load and locating the frequency at which the power consumption is minimized. Periodically tracking and adjustment of the frequency to maintain a minimum power consumption may be automatically performed. The load may be a SAW atomizer.

Abstract: An indicating device includes a mechanical dose counter adapted to count the number of doses that have been dispensed from or remain in a container and an electronic module coupled to the mechanical dose counter and adapted to record when the doses have been dispensed from the container. Methods of using and assembling the device are also provided.