Used in the days before and after D-Day, this device put out a distinctive clicking sound so that allied troops could communicate to "friendlies" by sound instead of with a bullet in the dark! Probably saved a lot of lives. Very few originals...

Emergency Whistle, RAYVENGE Unique Patented Designs Make Things Easier This little pealess whistle has everything you want a safety whistle to be: light, easy to blow, super loud, floatable, handy to carry, highly visiable. The lanyard & large...

Keeping a survival whistle may save your life in emergency situations Features: Ultralight, waterproof signal whistle for emergencies and wilderness survival It emits a shrieking, high-pitched sound Highly visible color can attract others'...