The SOL SHARX Whistle provides Exceptional Sound! The Whistle is Extremely-Easy-to-Blow! Works Wet or Dry! Flawless and Consistent Performance makes it the Preferred, Most-Reliable and Trusted Whistle for Search, Rescue, Outdoors and Personal Safety. The SOL SHARX Emits Effortless Authoritative Sound Power of 120 dB that can be Heard for Miles (kilometers) Over-Ambient Noises. Specifically designed to perform in the Nastiest Weather Conditions! Whistle comes with a Corrosion Resistant Stainless Steel Split Ring for attachment to a Lanyard or Clip.