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Review title: Great Loud whistle
Product review: Unlike what other retailers claim the Fox40 whistle is the USCG whistle. I've seen other companies claim theirs is used, but only the fox 40 has a national stock number (nsn 8465-21-912-7031)and is required for your survival vest. this whistle is loud at 115 db and easily works when submerged or partially submerged.
