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The Hailer family is great for use in high noise areas and large open spaces. Use it to direct emergency crews and alert crowds. It covers a football field! And unlike megaphones which cover your face, the Half-Mile Hailer lets you see and be seen. Great for crowd control, public safety, law enforcement, athletic events, band practice, field days, outdoor marketing events, auctioneers, political campaigns, missionaries, or any other outdoor application you can think of.