Traditional smoke alarms can only do one thing
Defending against fire is a chief concern for homeowners, and smoke detectors play a critical role in shielding your family. Despite that fact, smoke detectors have their shortcomings. For instance, they will only identify smoke, not heat. When there is a blaze starting in your residence, you may not be alerted until the smoke rises to the smoke detector. While there are further significant signs of fire -- including a sharp heat increase -- if there's no smoke, you will fail to get a triggered smoke detector.
In addition, smoke detectors only activate if they find enough smoke. When a fire creeps along slowly at first, you might not be alerted until the situation is out of hand. Various smoke detectors use dual-sensor technology, meaning they will be able to perceive smoke from both a blazing inferno and a more gradual burn. Then when they start beeping, it falls to the resident to contact the fire department after exiting the property.