Traditional smoke alarms will only do one thing
Fire safety is a chief concern for homeowners, and smoke detectors perform an essential part in safeguarding your family. Even so, smoke detectors have some drawbacks. For instance, they can only identify smoke, not heat. When there is a fire in your home, you may not be alerted unless the smoke rises to the smoke detector. Even though there are some other significant indications of fire -- such as a marked rise in heat -- if there's no smoke, you won’t have a warning from your smoke detector.
In addition, smoke detectors only beep if they encounter ample smoke. When a fire starts small, you may not be cautioned until it's too late. Various smoke detectors use more than one sensor, which means they will detect smoke from both a blazing inferno and smoldering remnants. Then when they do go off, it falls to the resident to contact first responders after safely leaving the property.