Schumann Resonator


I got 2 of these from Amazon...careful that free returns are applicable.  I charged them up, turned them on and holy moly.....they do help with my system.   What I hear is clarity....space between instruments, a definite difference in upright and electric bass, wider soundstage...you know...all the good stuff. At first I thought it might be increased brightness, but no....it is still the same in that regard.  I still can't believe it, and will listen again tomorrow (saved the packaging for the return)...but today, I'm about to keep them.
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What are these supposed to do and how do they do it? I read the description on Amazon and still can't figure it out. Does it emit "waves" from a built-in speaker or something else? I see one review of someone that wanted to keep it under their pillow at night but it was too bright.