Why you should add a photoelectric smoke detector to your security
LSHOME 3 Pack Smoke Detector Fire Alarms 9V Battery Operated Photoelectric Sensor Easy to Install with Light Sound Warning, Test Button,9V Included Safety for Home Hotel(912-3) (GS528A) - Amazon.com
Smoke Detector | DesignNest.com
Combo Smoke and Carbon Monoxide Detector for Command
Smoke Detector DIY | ADT Home Security Equipment Self-Setup