A "smoke alarm" is made up of two parts: a sensor used to detect smoke and a loud buzzer that can alert people in case of danger. A 9v battery is all you need to keep a smoke alarm running. Today, the most commonly used smoke detectors in the world should be photoelectric smoke detector and ionization smoke detector.
Some people ask: Is it useful to install smoke alarms? With the increase of modern family fire and electricity consumption, the frequency of family fire is getting higher and higher. Once a family fire occurs, it is easy to have adverse factors such as not timely fighting, lack of fire extinguishing equipment, and people in the scene panic, slow escape and so on, which ultimately lead to great loss of life and property. The main cause of home fires is carelessness and failure to take preventive measures in time.
A smoke alarm is a sensor used to detect smoke. In case of fire danger, its internal buzzer will alert people. So it is useful to install smoke alarms.
