| 摘要 |
A warning device for the prevention of drowning includes a sensor 10 incorporating a transmitter, the sensor being attachable to the body of a person. The transmitter is actuated upon submersion in water. The signal emitted by the transmitter is received by receiver 12 which is then adapted to initiate an alarm in the form of a siren, flashing light or lights or a transmission to other alarm systems. A directional antenna may be included for nautical situations where the wearer is thrown overboard.
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