The Location Earth Dog Tag is designed to serve as an intergalactic compass.
The tag on a chain is engraved with a diagram featuring crucial data an alien will need to get a human back to Earth from space.
Creator Mark Beagle who wears the necklace daily as a precaution says the diagram is based on NASA research.
It includes the mathematical location of Earth in relation to the solar system, a map of Earths continents, and two human icons waving as a gesture of goodwill.
There are no words etched into the data, so aliens who speak different languages will have no problem understanding the instructions.
Beagle has sold thousands of necklaces to everyone from families to UFO researchers.
Hes never heard of anyone actually using it during an abduction, but no ones ever returned one either.
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