Like the KN COSM BA, it has a voice alert to announce whether the hazard is smoke or carbon monoxide, but that and location information is not passed to other alarms in the system. It has been professionally reviewed by Consumer Reports as both a CO detector and a smoke detector, but with only middling ratings. Users are pretty pleased, however, though some complain of false alarms or of receiving the wrong/different unit compared to the model listed and pictured. At Amazon, it earns a 4. 4 star rating following more than 485 reviews. As is the case with smoke detectors, some states and cities require combination smoke and CO detectors to use a non replaceable battery with a 10 year lifespan. If that applies to you, the Kidde P3010CU Est. $55 is a model to consider. It's a stand alone alarm with voice warnings to signal the nature of the threat. The smoke detector uses a photoelectric sensor. We didn't see any credible expert reviews and user feedback is only so so 3.

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BIG BROTHER IS WATCHING YOU, the caption read” 3.

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