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Alternatively, in some implementations, the front cover plate 708 does not have the camera opening 712, but includes a substantially transparent area 712 that is disposed on top of the lens assembly 704 to allow light e. g. , visible and infrared light to enter the lens assembly 704. In some implementations, the camera opening or transparent area 712 has a size substantially larger than that of lenses of the lens assembly 704. By these means, the camera opening or transparent area 712 of the front cover plate 708 does not become a limiting factor for a margin of a field of view of the doorbell camera 106, and the size of the lens assembly 704 determines the field of view for the doorbell camera 106. Stated another way, the margin of the field of view is limited by physical features of the lens assembly 704, rather than by the camera opening or transparent area 712 of the front cover plate 708.

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01.14.2007 | 34 Comments

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01.14.2007 | 16 Comments

Still, the SC501CN's performance earns the highest possible grade both when it comes to smoldering fires, and as a CO detector. It receives top ratings across the board for detecting high concentrations of CO, low concentrations of CO and the quality of its alerts. The Kidde KN COSM BA Est. $35 is also worth considering. This combination smoke and CO alarm has been around for a number of years, and was previously known as the Kidde KN COSM B. It has two key differences compared to the SCO501CN 3ST: It is a stand alone detector that does not communicate with other alarms and the smoke detector uses ionization, not photoelectric technology. It has a voice annunciator that will identify the type of hazard fire or CO, but can't relay that to other detectors. It's not been professionally reviewed, but there's a large body of mostly satisfied users that post feedback at Amazon, where its overall score is 4. 4 stars following around 1,750 reviews. The Kidde KN COSM IBA Est. $40, previously known and sometimes still available as the Kidde KN COSM IB, is the hardwired version of the Kidde KN COSM BA but one with a significant difference: It can interconnect with up to 24 Kidde alarms plus an additional six sounding devices.