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A cover-attachment assembly works in conjunction with an audio-annunciator housing that is configured to operationally mount to a wall. This audio-annunciator housing can have one or more arcuately-shaped tracks and one or more snap interfaces. The cover-attachment assembly comprises at least one ar

A cover-attachment assembly works in conjunction with an audio-annunciator housing that is configured to operationally mount to a wall. This audio-annunciator housing can have one or more arcuately-shaped tracks and one or more snap interfaces. The cover-attachment assembly comprises at least one arcuately-shaped guide surface that is shaped, sized, and positioned to fit within the arcuately-shaped track when pivotally attaching the cover-attachment assembly to the audio-annunciator housing. The snap interface, in turn, is shaped, sized, and positioned to lockingly mate with the audio-annunciator housing snap interface to hold the cover-attachment assembly in an installed position with respect to the audio-annunciator housing.

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1. An apparatus comprising: an audio-annunciator housing configured to be mounted to a wall, wherein the audio-annunciator housing comprises: at least one arcuately-shaped track having an arcuate track length, the arcuately-shaped track including a pair of arcuate track surfaces disposed on opposite

1. An apparatus comprising: an audio-annunciator housing configured to be mounted to a wall, wherein the audio-annunciator housing comprises: at least one arcuately-shaped track having an arcuate track length, the arcuately-shaped track including a pair of arcuate track surfaces disposed on opposite sides of the track that extend along the arcuate track length; anda cover-attachment sensor;at least one snap interface;a cover-attachment assembly comprising: at least one arcuately-shaped guide surface having an arcuate guide surface length, the arcuately-shaped guide surface shaped, sized, and positioned to fit within the arcuately-shaped track between the arcuate track surfaces thereof, the arcuately shaped guide surface length configured to fit into the arcuate track length when pivotally attaching the cover-attachment assembly to the audio-annunciator housing;a cover-attachment sensor actuator that is configured to be sensed by the cover-attachment sensor when the arcuately shaped guide surface of the cover-attachment assembly is slidably pivoted betweeen the arcuate track surfaces of the auto-annunicator housing to indicate the cover attachment assembly is in the installed position; and at least one snap interface that is shaped, sized, and positioned to lockingly mate with the audio-annunciator housing snap interface to hold the cover-attachment assembly in an installed position with respect to the audio-annunciator housing. 2. The apparatus of claim 1 wherein the audio-annunciator housing comprises at least two of the arcuately-shaped tracks. 3. The apparatus of claim 1 wherein the at least one arcuately-shaped track is at least partially open on a side of the audio-annunciator housing. 4. The apparatus of claim 3 wherein the audio-annunciator housing comprises at least two of the arcuately-shaped tracks and wherein a first one of the arcuately-shaped tracks is open on a first side of the audio-annunciator housing and a second one of the arcuately-shaped tracks is open on a second side of the audio-annunciator housing that is opposite to the first side. 5. The apparatus of claim 1 wherein the at least one arcuately-shaped track has its entrance opening disposed at an edge where a top side of the audio-annunciator housing meets a front side of the audio-annunciator housing. 6. The apparatus of claim 1 wherein the at least one arcuately-shaped track is without any substantial non-arcuate discontinuity. 7. The apparatus of claim 1 wherein the audio-annunciator housing snap interface comprises an exterior feature of the audio-annunciator housing. 8. The apparatus of claim 1 wherein the audio-annunciator housing snap interface comprises an inflexible component and the cover-attachment assembly snap interface comprises a flexible, resilient component. 9. The apparatus of claim 1 wherein the audio-annunciator housing snap interface and the cover-attachment assembly snap interface are configured to readily facilitate hand moving the cover-attachment assembly from the installed position to a non-installed position with respect to the audio-annunciator housing. 10. The apparatus of claim 1 further comprising: a cover that is integrally combined with the cover-attachment assembly. 11. The apparatus of claim 1 further comprising: a cover that is non-integrally combined with the cover-attachment assembly. 12. The apparatus of claim 1 wherein the cover-attachment sensor comprises an electrical switch that is responsive to physically contacting the cover-attachment sensor actuator. 13. The apparatus of claim 1 wherein the cover-attachment sensor comprises an optically-based sensor. 14. The apparatus of claim 1 wherein the cover-attachment sensor comprises a capacitively-based sensor. 15. The apparatus of claim 1 wherein the cover-attachment sensor comprises a magnetically-based sensor. 16. An apparatus configured for use with an audio-annunciator housing that is configured to be mounted to a wall and wherein the audio-annunciator housing comprises at least one arcuately-shaped track defined by a pair of arcuately-shaped wall portions disposed on opposite sides of the arcuately-shaped track, a cover-attachment sensor, and at least one snap interface, the apparatus comprising: a cover-attachment assembly comprising: at least one arcuately-shaped guide member having a length and an arcuate guide surface along the length of the arcuately-shaped guide member, the length arcuately-shaped guide member being shaped, sized, and positioned to fit within the arcuately-shaped track between the pair of arcuately-shaped wall portions along a length of the arcuate track when pivotally attaching the cover-attachment assembly to the audio-annunciator housing;a cover-attachment sensor actuator that is configured to be sensed by the cover-attachment sensor when the arcuately shaped guide surface of the cover-attachment assembly is slidably pivoted between the arcuate track surfaces of the auto-annunciator housing to indicate the cover attachment assembly is in the installed position; andat least one snap interface that is shaped, sized, and positioned to lockingly mate with the audio-annunciator housing snap interface to hold the cover-attachment assembly in an installed position with respect to the audio-annunciator housing. 17. The apparatus of claim 16 wherein the at least one arcuately-shaped guide surface is without any substantial non-arcuate discontinuity. 18. The apparatus of claim 16 wherein the cover-attachment assembly snap interface comprises a flexible, resilient component. 19. The apparatus of claim 16 further comprising: a cover that is integrally combined with the cover-attachment assembly. 20. The apparatus of claim 16 further comprising: a cover interface configured to non-permanently secure the cover-attachment assembly to a cover for the audio-annunciator housing. 21. The apparatus of claim 20 wherein the cover interface comprises a snap-fit interface. 22. An apparatus for use with a cover-attachment assembly that comprises: at least two arcuately-shaped guide surfaces having arcuate guide surface lengths;andat least one snap interface; the apparatus comprising: an audio-annunciator housing configured to be mounted to a wall, wherein the audio-annunciator housing comprises:at least two arcuately-shaped tracks having an arcuate track length, the arcuately-shaped tracks including a pair of arcuate track surfaces disposed on opposite sides of an individual arcuately-shaped track that extend along the individual track length, the individual arcuately-shaped track being shaped, sized, and positioned to receive along its arcuate length, a corresponding arcuate length of the arcuately-shaped guide surface between the arcuate track surfaces of the individual arcuately-shaped track when pivotally attaching the cover-attachment assembly to the audio-annunciator housing;at least one snap interface that is shaped, sized, and positioned to lockingly mate with the cover-attachment assembly snap interface to hold the cover-attachment assembly in an installed position with respect to the audio-annunciator housing;anda cover-attachment sensor configured to sense a cover-attachment sensor actuator when the cover-attachment assembly when the corresponding arcuately shaped guide surface is slidably pivoted with the individual arcuately shaped track between the arcuate track surfaces to indicate the cover attachment assembly in the installed position and wherein a first one of the arcuately-shaped tracks is open on a first side of the audio-annunciator housing and a second one of the arcuately-shaped tracks is open on a second side of the audio-annunciator housing that is opposite to the first side. 23. The apparatus of claim 22 wherein the audio-annunciator housing comprises at least two of the arcuately-shaped tracks. 24. The apparatus of claim 22 wherein the at least one arcuately-shaped track is at least partially open on a side of the audio-annunciator housing. 25. The apparatus of claim 22 wherein the at least one arcuately-shaped track has its entrance opening disposed at an edge where a top side of the audio-annunciator housing meets a front side of the audio-annunciator housing. 26. The apparatus of claim 22 wherein the at least one arcuately-shaped track is without any substantial non-arcuate discontinuity. 27. The apparatus of claim 22 wherein the audio-annunciator housing snap interface comprises an exterior feature of the audio-annunciator housing. 28. The apparatus of claim 22 wherein the audio-annunciator housing snap interface comprises an inflexible component. 29. An apparatus comprising: an audio-annunciator housing configured to be mounted to a wall, wherein the audio-annunciator housing comprises at least one snap interface;a cover-attachment assembly comprising at least one snap interface that is shaped, sized, and positioned to lockingly mate with the audio-annunciator housing snap interface to hold the cover-attachment assembly in an installed position with respect to the audio-annunciator housing, the audio-annunciator housing and the cover-attachment assembly comprising at least one arcuately-shaped guide surface having an arcuate guide surface length that is shaped, sized, and positioned to move concentrically between a pair of arcuately-shaped track surfaces of an arcuately-shaped track and along an arcuate track length of the arcuately-shaped track when pivotally attaching the cover-attachment assembly to the audio-annunciator housing; anda cover-attachment sensor and a cover-attachment sensor actuator, the cover sensor configured to sense the cover-attachment sensor actuator when the arcuately shaped guide surface is slidably pivoted with between the arcuate track surfaces to indicate the cover attachment assembly and the cover-attachment assembly is in the installed position. 30. The apparatus of claim 29 wherein the audio-annunciator housing comprises at least two arcuately-shaped tracks and wherein a first one of the arcuately-shaped tracks is open on a first side of the audio-annunciator housing and a second one of the arcuately-shaped tracks is open on a second side of the audio-annunciator housing that is opposite to the first side.