Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.
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S&P 500 Index futures are down 0.5% as of 7:39 a.m. in New York, set to notch a monthly loss.