When HN users recommended it
1 HN user recommended this in 2021, in one comment.
20072026
Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.
Electromagnetic Radiation 5HZ 3500MHz Sound Light Temperature
Amazon's catalog no longer lists this product (checked 2026-11-02). The name comes from the link HN users posted.
Yeah, it actually looks like you can buy them on Amazon for about 30$. I don’t want to doubt but this seems so simple to test that the lack of any direct evidence makes me suspicious.
https://www.amazon.com/Electromagnetic-Radiation-5HZ-3500MHz...