OK:
I've played around with this "unit" for the past Two days...
https://www.amazon.com/Generator-Ultra-Low-Frequency-Rechargeable-Screwdriver/dp/B07NP3ZGZK/ref=sr_1...=
Yesterday, I placed it a few feet from my head while reading in bed and kept dozing off having odd/short dreams that I remembered upon awakening.
Usually I do not have dreams (or I do not remember them if I do have them) and I am an exceedingly light sleeper waking up constantly to reposition my body due to common aches and pains for someone my age who was rambunctious/accident prone in earlier life.
So, this was my first immediately recognizable effect of the device.
I also noticed that (while awake) my stomach started to churn/gurgle after 10-15 minutes of being in close proximity to the device.
In addition I noticed that instead of the unit relaxing me I ended up clamping my jaw (not a good thing) and I also failed @ doing my usual breathing/relaxation exercises which usually cut my old aches and pains (migraines aside) by 90%+.
Today I played around with the device while watching a recording of Clapton's Crossroads 2019 video on a 20" Samsung flat screen TV located on a blanket chest @ the foot of the bed.
The TV (placed mid-room without a wall behind it) has a reflection screen, slightly larger than the size of the TV, mounted a few inches off the back to help duplicate close to wall mounting.
If I placed the face of the device (handheld) towards the TV the sound became distant with decreased dynamics/detail - colder and thin is a good descriptor.
When I reversed it directing the face of the device towards me the sound became fuller and louder with increased detail and dynamics, like it was sucking the music towards me.
The changes were easily heard and repeatable.
I suggest that anyone experimenting with this tech first try what I did, due to the simplicity of doing so.
Not keen on the clenching jaw effect as well as it seeming to interfere with my daily bio-feedback/self hypnosis/meditation (whatever you want to call it) excercises.
Just saying that with this particular unit the changes in (TV) sound were extremely apparent.
Assume that it would be a PITA to adjust/align them with the main HiFi setup, but "this unit" definitely altered the perceived sound as mentioned.
DeKay