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Re:Nest introduces their Smoke Detector by tumblen on Tuesday October 08, 2013 @04:36PM (#6517669)
Most detectors only have one sound.

It seems that the Nest will specifically tell you with words that it has detected CO, so you'll listen.

I wouldn't be surprised if the CO detection can'd be dismissed since you would never really want to dismiss it (unlike smoke).

Re:Nest introduces their Smoke Detector by smithian on Wednesday October 09, 2013 @08:38AM (#6520846)
Perhaps I'm in the minority, but all combined CO/smoke detectors I have ever owned have a distinctive alarm for CO. Usually a spoken alert warning of CO.