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1, which is an example of a smart device 204, is a low power node. In addition to housing a light source, the smart nightlight 170 houses an occupancy sensor, such as an ultrasonic or passive IR sensor, and an ambient light sensor, such as a photo resistor or a single pixel sensor that measures light in the room. In some implementations, the smart nightlight 170 is configured to activate the light source when its ambient light sensor detects that the room is dark and when its occupancy sensor detects that someone is in the room. In other implementations, the smart nightlight 170 is simply configured to activate the light source when its ambient light sensor detects that the room is dark. Further, in some implementations, the smart nightlight 170 includes a low power wireless communication chip e. g.

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8. 99/year for 30 days of videoReasons to BuyApp and hardware are well designedHindSight captures video before motion alarm is triggeredWorks with many smart home systemsIntegrates with smart lock and keypadReasons to AvoidCan't set motion zonesRelatively expensive cloud costsRelatively narrow field of view$97. 45 View at Amazon$111. 50View at Walmart$199. 99View at Best Buy?August's video doorbell has a clever HindSense feature that includes a couple of seconds of video before the motion is detected, which means the device is more likely to capture a usable image. While August's doorbell doesn't have the highest resolution among the cameras we tested, the footage was clear enough that we could see people's faces, and we liked that its spotlight helped illuminate whoever was coming to the door at night.

 

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In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room, for example when the environment is not suitable for humans. CCTV systems may operate continuously or only as required to monitor a particular event. A more advanced form of CCTV, utilizing digital video recorders DVRs, provides recording for possibly many years, with a variety of quality and performance options and extra features such as motion detection and email alerts. More recently, decentralized IP cameras, perhaps equipped with megapixel sensors, support recording directly to network attached storage devices, or internal flash for completely stand alone operation. The earliest video surveillance systems involved constant monitoring because there was no way to record and store information. The development of reel to reel media enabled the recording of surveillance footage.