Ordinary smoke alarms will only do one thing
Defending against fire is important, and smoke detectors play an essential role in safeguarding your family. However, smoke detectors have their limitations. For example, they will only detect smoke, not high temps. When there is a blaze starting in your house, you would not be warned before the smoke rises to the smoke detector. Even though there are further unmistakable signals of fire -- such as a marked increase in warmth -- if there’s a lack of smoke, you will fail to get a sounding of your smoke detector.
What’s more, smoke detectors only sound the alarm if they encounter enough smoke. If a fire begins slowly, you might not be warned until the flames are out of control. Some smoke detectors utilize more than one sensor, which means they will recognize smoke from both roaring flames and a more gradual burn. If they do go off, it falls to the resident to call emergency services after they safely leave the residence.