In a specific example, the first fastener structure 806 includes a snap fastener configured to lock onto the respective fastener structure 726 of the device housing 702. The mounting plate 800 may further include a first hole 908. The first hole 908 may be located on or in proximity to the raised edge of the mounting plate 800, allowing a release tool 912 to access the first hole 908 when a flat portion of the rear surface of the mounting plate 800 adheres to the mounting surface. The first hole 908 may be located on or in proximity to the first fastener structure 806. The release tool 912 may have an extended long apical part that fits into the first hole 908. The release tool 912 can be inserted into the first hole 908 to gain an access to the first fastener structure 806 or the second fastener structure 726 that mates with the first fastener structure 806 when the device housing 702 is mechanically fixed onto the mounting plate 800.

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This type of technology is used a bit different in larger spaces, where the light beam is directed towards the sensor, but if the intensity of the light drops under a certain level due to smoke, the alarm will be triggered.

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