alert pendants

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. Such a substantially large camera opening or transparent area 712 enables a substantially wide angle view for the doorbell camera 106 when a wide angle lens assembly is applied. In some implementations, the front cover plate 708 includes a substantially opaque area that is distinct from the substantially transparent area of the camera opening 712. An interior surface of the substantially opaque area is painted with dark color ink e. g. , black ink. The dark color ink could be transparent to infrared light, such that the substantially opaque area is opaque to visible light and transparent to infrared light. In an example, the interior surface of the front cover plate 708 is entirely covered by the ink except the button opening 710 exposing the button top 706 and the substantially transparent area 712 covering the lens assembly 704. Further, in some implementations, the doorbell camera 106 includes an array of IR illuminators not shown in FIGS.

Posted March, 2011 by Admin

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home alarm systems monitoring

The smoke sensor in the Nest Protect is different than any other smoke alarm we've looked at. The unit uses a split spectrum sensor, a special type of photoelectric sensor, which is designed to detect both smoky and flaming fires. The Nest Protect also has a built in a carbon monoxide sensor and will sound an alarm if it detects dangerous levels of the invisible, odorless gas which can be lethal if you breathe it for too long. To help cut down on false alarms from steam and burnt toast, the Nest Protect also uses humidity and heat sensors. We tested the detection capabilities of each smoke detector in our comparison by spraying test smoke from an aerosol can directly at each one from 5, 10 and 15 feet away. When we tested the 5 and 10 foot mark, the Nest Protect sounded its alarm after 18 seconds. At 15 feet, the alarm activated at 28 seconds. It should be noted that Nest Protect was the only smoke detector that passed all of our detection tests. Half the devices could not detect our test smoke from 10 feet away and only Nest Protect sensed danger from the 15 foot mark. All smoke alarms feature a loud blaring tone to alert you to potential dangers in your home. Nest Protect goes a step further by adding voice alerts that calmly tell you what kind of danger is present, where it is and how to proceed.

home automations

”Abode provides one of the most robust displays of third party integrations in this lineup.

Burglaries are major sources of guns for criminals, although estimates of the percentage of crimes involving stolen guns vary widely.

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Posted February, 2011 by Admin

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