UST StarFlash Mirror/JetScream Whistle Combo StarFlash Mirrors targeting system allows you to aim your signal with pinpoint accuracy 122db JetScream whistle can be heard over most natural and man made noises Can be seen for miles away on a clear day, attached by lanyard to one of the loudest whistles available Unbreakable, scratch resistant mirror floats as does this pea-less whistle that will never freeze up or rust Great for boaters, hikers, kayakers, hunters, fisherman - any land based or water based outdoor adventure