The "science" behind them is full on quakery.
Heres the company that makes them:
EMF Tech – Memon Technology 2021
And heres who does the "science" for them:
Dartsch Scientific | Cell biology | Research (dartsch-scientific.com)
Oddley enough in their listed publications neither Memon nor EMF protection are covered, so even though they did the testing behind it, it wasn't conclusive enough to publish anything.
Memons base claims:
memon-effects-EN.pdf
Their supporting evidence which, although well presented (to the layperson) has a lot of dubious sources (some uncredited) and theories (talking to water nicely improves it quality, YES REALLY).
It reminds me of a similar product on the market SmartDots, which recently got a slap on the wrist by the ASA:
'Anti-radiation' phone stickers still sold on Amazon - BBC News
Their UK website has since closed down (although you can still purchase from their Trade or US pages). They had a similar "science" source:
Home – BION Institute
And a testimonial of the quality of the research:
RUBIK-Peer-Review-Report-on-smartDOT-study-by-BION-INST.pdf (energydots.com)
The irony is even if the research is genuine, and the studies authentic (of the biological effects), their whole arguement revolves around EMF, which independent testing has shown isn't changed.
Sometimes they mention that the research is based on results of a possibly unknown trigger (Dartsch is particularly vague, talking about Dark Matter etc), but then the companies market it as EMF protection anyway?