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Made of durable ABS plastic, the pea-less and powerful UST JetScream Floating Whistle is an ideal wilderness signaling device with an ear-piercing 122 decibel (dB) shriek making it one of the loudest of its kind. It can easily be heard over most natural and man-made noises. Compact, flat, and buoyant, the JetScream?s pea-less construction won?t freeze, clog or rust and is just as effective wet.