The Ultimate Survival Technologies Hear-Me Whistle, Orange makes a high-pitched noise that can bea heard far and wide and over most man-made or natural noises. It features a pea-less design so it won't clog or freeze up and works even when it got wet, muddy or dusty. It works in all sorts of weather conditions. It includes a break-away lanyard so you won't lose it and you won't get hung up on a rock or tree branch with it either. The clip attachment keeps it handy and quick at the ready.