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anti drowing alert system
I think this is pretty cool.
The SOS Alert System can be worn on a headband by an experienced swimmer and set to go off after a dangerous period of submersion or worn on a wristband by a non-swimmer, going off immediately upon contact with water. The product also features a “panic button,” which a swimmer can push at any sign of danger to themselves or others in the water.
https://www.indiegogo.com/projects/sos-save-our-swimmers-alert-system/#/