Sirens

In every neighborhood there is an emergency siren which is used to alarm everyone when there is any type of natural disaster occuring or about to occur. A month ago many of us were woken by this siren notifying the hawaiian island there was a tsunami heading our way.  The sound this siren makes always has the same frequency so people are able to recognize the sound but becuase the sound needs to reach so many people, the amplitude or volume of the sound is very loud.  Unfortunately for me and my family we live right next to the siren in our neighborhood so the every hour we were blasted with the loud annoying sound of the alarm.  Luckily this alarm helped to save some families across the islands because they were able to get to higher grounds.