Smoke alarms go through very specific tests, so I would and will continue to depend on the alarms provided with the house, I have already replaced ALL of these when the first one failed (3 beeps) after about 8 years. I believe these are supposed to use some type of advanced detection system, and there are more installed than the original installation, for example the attic and the garage. No idea how well the ones in the attic will survive in the summer heat, or the battery backup.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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