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Nest Hello uses HDR, which helps lighten shadowy areas while not blowing out bright areas.cost home security systems
99View at Newegg Business$127. 65View at Amazon?Nest’s smoke alarm detects both smoke and carbon monoxide, and when it does pick up something, it will not only sound an alarm, but will also tell you in what room the alert is coming from, and the nature of the alert. An LED ring on the bottom of the alarm also changes color, giving you a visual cue. The Nest Protect comes in both wired and battery powered versions. If you have more than one in your home, and one goes off, the others will too, alerting you to the location of the fire. The Nest Protect also works with a wide range of smart home devices.