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When ship wrecks, the communication equipment will fail after power outages ,the people on board can not be issued a distress signal at the wreck. And the emission signal method only firing flares,the method is single.
Can put a rescue whistle in the life buoy, The “Life buoy + rescue whistle”in addition to whistle basis function， and install an ultrasonic signaling device in the whistle.
Normally，the people body physical weakness after in water.So,this whistle can make the person blow the whistle doesn’t need much physical strength.The device can be a signal by a small amount of air ,save the physical strength of a person .