Has anyone here heard about Powerfoyle?
There are now headphones available that charge with a "Powerfoyle" solar panel in the headband. Somewhat surprisingly, that apparently even works decently, i just read a test that even cloudy German autumn sun is sufficient to charge the headphones, with an app screenshot showing around 13 mA current coming from the panel, with the headphones using a bit more than 3 mA.
I was not able to find much details about this "Powerfoyle". All websites are either pretty marketing pages or other sites testing the headphones.
Supposedly, Powerfoyle uses the principle of photosynthesis. For me that sounds like pure marketing hogwash.