ABS plastic will not stick to lips and mouth in cold weather. This whistle could be heard under water up to 50 feet. The sounding chamber forces all water to be purged when the whistle is blown. This patented whistle may be used either with alanyard or clipped onto a lifejacket. It can creat a clear, high frequecy sound,with a power rating over 75% greater than other traditional safety whistles.
Basic emergency whistle signals are as follows: SOS - 3 short blasts,3 long blasts then 3 short blasts