The siren is an audio device and is a warning system for the fire alarm system.
When the fire comes on, after the command of the sensors to the central panel, the panel will command the siren and they will begin to alert.
The sound of all sirens that are installed in a building should be sound consistent and heard everywhere in the same way.
This part of the fire alarm system is installed as a ceiling or wall, and along with some sirens a flashlight is also fitted.
It can be said that in the event of a noisy noise and no sound of the siren, the flashlight fires the people in the event of a fire.
Deaf people are also aware of the fire