The JetScream™ Whistle was developed by former U.S. Air Force survival expert, Rick Stewart, who sought to develop a low profile, pea-less whistle for survival, safety, and communication purposes. This unique whistle focuses manmade air streams through harmonically tuned chambers to create a piercing shriek audible over most other natural and man-made noises. Due to its pea-less design, JetScream™ even works when wet, making it the perfect accompaniment to all outdoor activities near rivers, lakes, or oceans. Flat enough to fit in your pocket and attached to a lanyard, the JetScream™ is just as useful in the city as it is in the woods. The JetScream™ can be found in the survival kits of some of the most elite government forces, including the United States Air Force and the Navy Seals.