I have a similar Schumann resonator from Acoustic Revive (https://www.acoustic-revive.com/english/roomtuning/rr-77.html). This is quite a low cost product and can be purchased for something like USD $300 in Japan, it's also been around for quite a while. What it does is lighten the weight of the atmosphere in the room. It's that simple and the change is quite significant. Turn it off and the room atmosphere becomes hard and cold, turn it on and the room atmosphere feels airier and less dense.