Smoke poisoning is the most common fatal factor in indoor fires. A salesman claims that his company's new fire alarms have built-in sound sensors that make unique sounds when building materials are exposed to high temperatures, and that the alarms accurately detect those sounds and sound alerts before building materials actually catch fire. Allows residents to escape before being trapped by smoke
The installation cost of the alarm system with built-in sound sensor is much higher than that of the traditional smoke alarm system
they can better replace traditional smoke alarms.