| 摘要 |
A multi-function emergency device combining a flashlight mounted on a housing with one or a plurality of beacons. A terrestrial location of the device is determinable by GPS or cellular triangulation. A first beacon employs visible light for responders to follow to the terrestrial location while a second beacon employs invisible light to transmit a secret beacon that cannot be seen without the aid of a viewer. A message may be encoded into the second beacon and deciphered.
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