Use the Harmony Acme Tornado T2000 Whistle to signal for help or get attention when you're boating, biking, or backpacking. A simple blow on this compact whistle produces a loud, powerful sound that travels over long distances with clarity. An emergency whistle is necessary for safety on the water, but you can also carry the T2000 for peace-of-mind when you go for a hike or run in the woods.