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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"Mendonça Filho's film explores a time of political corruption, violence, and warranted paranoia through a human lens," I wrote in my review. "With Moura's powerful performance framed by a reverent, authentic aesthetic, The Secret Agent is a deeply humanised look at a historical moment of authoritarianism and government corruption. It's a must-see."* — S.C.