Amazon’s Fire TV Stick 4K Plus is on sale for $29.99, which is $5 shy of its best price. | Image: Amazon
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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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Pre-order LG's 52-inch gaming monitor and get a $200 gift card
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