Three different tones, you can choose any one of them according to your need.
Super loud sound, the alarm volume is over or equal to 100dB
Built-in LED light, it will send out alarm signal when there is super bright, effectively to remind people flee from fire.
The acousto-optical fire alarm apparatus are one kind of terminal device for alarm, it is fit for the sound & light alarm when the fire happens.
It is an essential choice of siren for your fire safety systems.