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.
也许正因如此，有这么一家公司，靠卖数据线发家，市值 260 多亿，去年营收 61.66 亿，最近又去港交所上市了。
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A tale of (at least two) mods