Ysignal-sending / lifebuoy/life jacket

The signal-sending lifebuoy/life jacket: the lifebuoy/life jacket that can send the signal for rescue.
The lifebuoy and life jacket are often made in the fresh colors such as orange because the fresh colors can stimulate the eyesight nerves in our eyes. However, it is difficult for the rescuers to find the people in the water at night. Besides, with the life jacket, the people in the water have to wait passively for the rescue. They cannot send the signals for rescues in an active way.
This produce smartly combines the signal generator with the lifebuoy/life jacket.