Two entrepreneurs say they're developing an airborne surveillance device, based on military-grade equipment, that could someday provide cost-efficient intelligence to law enforcement officials or search-and-rescue operations. Vlad Gostom and Joshua Marpet say they took their idea from the Firefly battlefield device, which sends a wireless camera hurtling through the air, giving soldiers a clear view of the surrounding battlefield for a few seconds. The pair are one of several teams showing off devices at the Defcon hacking conference that are based on military technology but that have civilian applications.

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