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The spirit box is a.am or fm radio set to keep scanning all it does is pick up random broadcast . I don't think any of the phone apps work . A e v p. Is something different. It's picked up on a recorder , it takes time to go through a recording and most investigators don't want to do it. There is what is called a Tesla spirit box. It's basically a crystal radio set with an amp . I plan to build one ,if I get any thing interesting I will post them. There is also a mic. inside a box made out of mirrors, I don't know what results have been got with it.
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