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The way to differentiate the first and the second generation of Nest Protect is by verifying if it has a battery door the Nest Protect 1 does not have one, verify the back plate the second generation has a round backplate, while the first has a square plate and the easiest one is to look at the edges of the device the second generation has rounded corners all around the case, while the first gen has straight edges. Right now, on the market, there are three types of smoke detectors: those that use ionization sensors, those that use photoelectric sensors and lastly, those that use both type of sensors also called dual sensor smoke alarms. The Nest Protect, theoretically, falls into the last category, but things are a bit more complicated because it doesn’t have a ionization sensor, but it does use the Split Spectrum Sensor which nullifies the need of the radioactive ionization sensor as you know, it detects smoke produced by flaming fires which burn at a fast rate so, if the ionized air is disrupted by smoke, it triggers the alarm. The photoelectric sensors is used to detect any smouldering fires that uses a light beam which, normally does not hit the sensor, but when smoke scatters the light particles, it will hit the sensor, therefore triggering the alarms – this method is used to detect a fire in its early stages, therefore reacting a lot faster. Now, the Split Spectrum Sensor should detect both the flaming fires and the smouldering ones, by adding a blue LED light at a wavelength of 450nm to look for small particles which are an indicator of a rapid, fast burning fire and keeping the usual photoelectric sensor to detect smouldering fires. To make sure it doesn’t repeat the mistakes of its predecessor annoying false alarms, the new sensor is isolated from any outside light and the encasing is designed to only allow smoke in and nothing else this worked just fine since the second generation of Nest Protect is indeed less prone to false alarms.

Posted March, 2011 by Admin

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Alternatively, in another example, each of the first and third fastener structures 806 and 808 includes a respective snap fastener configured to lock onto the respective fastener structure 726 or 728. The mounting plate 800 may include an opening 810 configured to let through one or more electrical wires, such as the power supply line and the ground line that can be electrically coupled to the plurality of wire terminals 720 of the doorbell camera 106. In some implementations, in accordance with the process 850 of mounting the doorbell camera 106, the mounting plate 800 is fixed onto an area of the surface where the power supply line and the ground line are located. The power supply and ground lines come out of the surface, pass through the opening 810, and are connected to the plurality of wire terminals 720 located at the rear exterior surface of the doorbell camera 106. The device housing 702 is then mounted onto the mounting plate 800 via the fasteners 806 and 808 and their respective fasteners 726 and 728 located at the rear exterior surface of the doorbell camera 106. The power supply and ground lines are concealed within the opening 810 of the mounting plate 800 and the first recess 724A of the device housing 702. Under these circumstances, the depth of the first recess 724A is configured such that a cumulative depth that sums the depth of the first recess 724A and a depth of the opening 810 is greater than a height of connections formed between the plurality of wire terminals 720 and the power supply and ground lines. By these means, the device housing 720 may be securely mounted onto the mounting plate 800 without being withheld by the connections formed between the plurality of wire terminals 720 and the power supply and ground lines. FIGS. 9A 9E are a front perspective view, a rear perspective view, a side view, a top view and a bottom view of a doorbell camera 106 mounted onto a mounting plate 800 in accordance with some implementations, respectively. FIGS.

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Works very well, but it could be a just a little better by being able to be connected to multiple users and smart phones.

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Posted February, 2011 by Admin

Filed under Uncategorized | Edit | (2) Comments