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.
Jacob Alon has been announced as the winner of this year's Critics' Choice award, while Noel Gallagher will be presented with Brits Songwriter of the Year and PinkPantheress will be honoured with the Brits Producer of the Year award.
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As critical talks over Iran’s nuclear programme entered their second round on Thursday night, and a vast US military buildup continued in the Middle East, the Trump administration warned of drastic consequences if Iranian negotiators failed to make significant concessions.