Broad spectrum beta-lactamase inhibitors. The wireless device includes display logic operable to determine that displayable content is available to the wireless device. The optical unit has engagement features which abut alignment features on the sensor unit as, for example, portions of the cover outer surface, so as to maintain a precise relationship between the optical unit and sensor unit. In some embodiments, the primary endpoint may contact the secondary endpoint and may then pass endpoints to the secondary endpoint. The secondary comparator uses multiple undervoltage thresholds depending upon the power state of the radio communication device. Further, a method for calibrating the position detectors is described.