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.
Apple doesn’t participate in MWC or other trade shows, preferring to show off its products at its own events. This week, it’s releasing a series of new products with hands-on events in select cities.
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