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How long do Simplisafe smoke detectors last? 

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It is shown that such a smoke detector is able to operate reliably under low concentration of smoke and high relative humidity conditions.
The results of these experiments show that the smoke detectors, especially the ionization detector, are sensitive to cooking fumes and nuisance alarms are easy to happen.
This difference could have an impact on detection criteria and hence the alarm time for photoelectic smoke detectors since they alarm based on the scattering properties of the smoke.
Based on the work discussed here, the author suggests that a new test standard be implemented to evaluate ionization-type smoke detectors.
This is critical in scenarios where traditional smoke detectors cannot be installed.
Efforts to increase protection with smoke alarms should be augmented with programs to insure adequate and timely testing and maintenance of existing smoke alarms.
However, the learning of smoke representation in the detectors will be restricted by the appearance gap between real and synthetic smoke samples, which will cause a significant performance drop.
Alarm algorithms utilizing ionization detector smoke measurements proved to be more effective than measurements from photoelectric detectors.
The results show that improved fire-detection capabilities can be achieved over standard smoke detectors by combining smoke measurements with CO measurements in specific algorithms.
The current alarm algorithm resulted in better overall performance than the commercial smoke detectors, by providing both improved nuisance source immunity with generally equivalent or faster response times.

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