I have bought another SW1 after the first purchase..they have the same Shumann wave..
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I opened the SW1 and it is the exact same design as the RR-77 from the pics I've seen. It works but I have not compared it to the RR-77. I went so far as to tweak it with a beefer PS and placed a Quartz crystal on the LED and my hands started tingling and I got a little whoosy. I might have to revert back to the orginal PS.