Jetscream Whistle is extremely loud - 122db loud! And great for the paddler; this whistle floats too. UST (Ultimate Survival Technologies) Jetscream Whistle has a flat profile to fit nicely in your PFD pocket and includes a lanyard. A whistle is a simple, inexpensive signalling device that all paddlers should carry. Keep it with your PFD and hope that you never need it....oh, and always wear your PFD!