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When you are alone at night, you can feel like you are particularly susceptible to a break in, regardless of the actual danger.

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$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.

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In these cases, residents can die from smoke inhalation before flames ever break out.

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Homeowners get phone alerts with streaming video if the doorbell rings or the device's heat sensors detect a person or a passing car.

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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. If you have multiple Nest Protect smoke alarms installed and networked in your home, alerts will sound on each of them, warning everyone in your home about the danger. You can hush the alarm with the app if there's a false alarm. When Nest Protect detects threats in your home, it sends a notification directly to your smartphone.

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The alarm system won't only save your home from destruction as it can avoid accidents in your loved ones as well.

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