The Survival Whistle is perfect for situations where a loud audible distress signal is needed. The cork allows a variation of pitch in the audible signal allowing possible rescue parties a better chance at hearing the sound. The lanyard keeps the whistle secure to your person or pack. Directions: Inhale a large breath of air, grasp your lips firmly to end of mouth piece and blow. Ensure cork is free from obstruction. Three loud 2 – 3 second bursts is the international sign of distress. Not a toy. Imported.