this seems legit...(that's sarcasm)

[Osteomata]

While it is quite clear that the claims resulting from the use of this device are bogus, there is an actual circuit inside. It can't be just an LED that lights when you plug it in. What do you think this circuit is?

I think that is exatly what it is, a 12v DC LED light.
"we cracked open the FD-47 to find a simple circuit board for the LED lights."

[Cobrajet]

"we cracked open the FD-47 to find a simple circuit board for the LED lights."

Wouldn't that void the warranty? All the magic dust escapes!