A wide input range power supply for a circuit protection andor fault detector device includes a passive supply for providing power to a load under nominal input voltage conditions at or near the nominal line voltage with minimum power loss, and a linear regulating supply path for assisting the passive supply at an input line voltage substantially below the nominal line voltage value. A wedge mechanism comprising a first wedge member and a second wedge member are disposed in the insert, and have slidably engaged angled faces. This disadvantage can be avoided with the device for testing liquids. The speaker elements may be connected such that sounds produced by both speaker elements emanate from different respective sound openings defined in a surface of the smaller speaker element.