In short, it’s a life-saving device that emits an S.O.S. signal in Morse code over both the AM and ... plans would have the circuit built into a flashlight-like device equipped with red and ...

SOS is a Morse Code distress signal. Morse Code is a system that uses dots, dashes and spaces to communicate letters and numbers. It was first created during the 1830s by Samuel F.B. Morse but was ...