The Fox 40 Sonik Blast CMG Marine Whistle with Breakaway Lanyard with a sporty new multi-colored design, it emits a louder pitch without any effort, standing out among the crowd. The Fox 40 Sonik Blast CMG Marine Whistle with Breakaway Lanyard has a 2-chamber, 4 resonators, pea-Less design, with 120dB emitting a distinct louder pitch without much effort.