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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 .
Other nearby ships and helicopters can by the ultrasonic receiver to find the people that need it, and the prompt rescue,provide a method for salvage.