NiteCore NWS20 is the loudest emergency whistle on the market, an upgrade from the NSW10, this whistle has a double-chambered design that allows for higher decibels with little effort. Made of titanium alloy, NWS20 is durable, lightweight and compact. You can put on your keychain or hang around the neck. Ideal for boating, scuba diving, hikers and personal safety. Widely used by Security, Military, Police, and crime prevention units.
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