The issue is, that we talk about a potential placebo/nocebo effect, which means you need to make sure to get rid of all ambigiousities.

And tbh buying / using a device made by a Anti EMF Page/Company who sells EMF protection is everything but trustworthy.

You know bias, fake shops, gold audio cables, crystals etc.

Now: Have you done a proper blind test? What was your experiment setup? How often did you repeat it? And what does it mean