According to the NFPA, 59% of home fire fatalities occur in houses that have no working smoke detectors. A properly installed and tested home fire alarm with a fresh battery is one of the simplest and most effective things you can do to protect yourself and your family from a home fire. In smoke detectors that have replaceable batteries, be sure to change your batteries at least once a year or when the smoke detector begins to chirp to signal a low battery.
You can review this mini-lesson to refresh your smoke detector awareness.