Spirit Boxes

Hi everyone!

I'm looking for technical informations about the Spirit Boxes.

-What's inside?
-How does this technically work?
-Does it scans Am and FM frequencies?
-At what speeds does it scans (if I understood there are different settings)
-What is the time between scans? (How long does it stay on one frequency before switching to an other?)
-Is there a more popular model?

Thanks y'all!

via International Skeptics Forum https://ift.tt/3lm1By1