Outdoor sirens provide warning over a wide area . For example , large systems in the event of a tornado warning or emergency alerting related to a nuclear plant can cover hundreds of square miles .
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However , many applications ( colleges , industrial parks , military bases ) also need the ability to alert people inside buildings . Intelligence , flexibility , and configurability are important in these applications .
ATI ’ s Indoor Speaker
Figure 2 . ATI ' s Pole Mount and Trailer Mobile Installations are capable of rapidly providing highly intel- ligible , lifesaving directions to the local populace .
Unit ( ISU ) is available with a range of options that will support a wide variety of customer requirements . The ISU can directly drive up to 400 watts of speakers ers
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