The JetScream™ Whistle is a low profile, pea-less whistle for survival, safety, and communication purposes. This exceptional whistle focuses manmade air streams through harmonically tuned chambers to produce a piercing shriek audible over most other natural and manmade noises. Because the whistle is pea-less, JetScream™ even works when wet, so it is the perfect accompaniment to all outdoor activities near rivers, lakes, or oceans. Slim enough to fit in your pocket and attached to a lanyard, the JetScream™ is just as practical in the city as it is in the woods. The JetScream™ is included in the survival kits of some of the most elite government forces, including the United States Air Force and the Navy Seals. Length: 2.3". Wt: 0.3 oz.