Install one of these puppies in your headsets and go to town chatting up your fellow marines at a con... provided you stay within 250 feet (~76m for you metric types) of each other.

Not as great as FRS radios, because you can have only a maximum of five people linked together (with the optional booster gadget) and there is that range issue. On the bright side, you probably wouldn't get cross chatter at a big con, with lots of people gabbing away on their FRS handsets.

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~Jay