Simple snake oil detection

Didn't mr PT also say "there is a sucker born every minute"?

Good question. No, he didn’t. Thanks for asking. It appears that’s another Old Wives Tale promulgated by Scaredy Cat Skeptics. 🙀

Schumann frequency generator explained (from Acoustic Revive website)

The "Schumann Resonance" is a resonance frequency that exists in the Earth's "electromagnetic" cavity; i.e. between terrestrial surface and ionosphere. German physicist W.O.Schumann first detected the resonant properties of this terrestrial cavity in 1954. It is said that the Schumann Resonance is a breathing phenomenon of the Earth that is lasting from old time of the Earth creation and is giving a positive effect to the human brain.

Humans, animals and plants have become accustomed to this frequency of 7.83Hz over a very long period of evolution.

But recently, many unnatural radio waves and electromagnetic waves disturb this frequency of 7.83Hz, it has changed the influence that it has on us.

Our research was started from the point of view that [If Schumann Resonance Waves have a positive effect on the human brain, how does it react to human hearing?], it became clear that there was a surprising effect to both of hearing and sight.

Then, we developed and manufactured a device to generate the 7.83Hz electric wave artificially, the Ultra-low Frequency generator RR-888 (Patent Pending)

Picture quality improves as well by the RR-888
A focus of the picture is improved!

The RR-888 brings a great ability of a projector, such as CRT Projectors, DLP Projectors, Liquid projectors. By using RR-888, the focus of the picture is much improved.

"but if a wire is worth more than stainway grand,"

stainway grand?

Is that the same company that makes those roledex watches?

For the Schumann resonance:
https://skeptoid.com/episodes/4352