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.
如今，随着凤凰城的发展，Sun City已经成为宜居的郊区：年阳光天数达299天，户外活动丰富，犯罪率低，生活成本适中；再加上两家医院服务于高需求的老年群体，能提供稳定的就业机会，吸引力已经显著提升。
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