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While researching for this comparison, we looked into the differences between the sensors each smoke detector uses and found research from Underwriters Laboratories UL that suggests you should have both photoelectric and ionization type smoke detectors in your home since each type is suited for different types of fires.home security system cameras
Furthermore, the memory 406, optionally, stores additional modules and data structures not described above. In some implementations, the smart device 204 includes a doorbell camera 106, and the doorbell camera 106 has physical features that can provide real time camera status information and/or audio/visual content that indicates or complements camera processing activity, to occupants of the environment without disturbing operation of the camera or the occupants. In some implementations, such physical features include a light ring that is provided at a periphery of a front cover, a periphery of a camera lens, or a periphery of a button on the doorbell camera 106, and is configured to be visible to occupants of the environment from a wide range of positions in the environment. For example, in some implementations, the light ring is configured to be visible in a range of positions that include at least areas of the environment that fall within the camera's field of view. In some implementations, the light ring has a plurality of individual lighting elements, each having associated lighting characteristics that are individually controllable to reflect local camera status and/or a camera processing state/operation. In some configurations, the controllable lighting characteristics include one or more of on/off state, hue, saturation and/or brightness/intensity.