Your first line of defense against fire
Test all smoke alarms by pressing the test button. You should hear a loud alarm.
Vacuum or dust your smoke alarms to keep them working properly.
Replace batteries in all smoke alarms (unless they have 10-year sealed batteries).
Replace all smoke alarms. Check the manufacture date on the back of the alarm.
More responsive to flaming fires. Best for areas away from kitchens and bathrooms.
More responsive to smoldering fires. Less prone to false alarms from cooking.
Use both ionization and photoelectric technology. Provide the best protection.
Content source: National Fire Protection Association