Can Anyone Explain How This Works?

[redwhiteandthemaple]

FretFX

It doesn't require you to modify anything and it doesn't affect your playability.

Well.. That's what they say anyway. And of course, it's independent of the guitar circuits..

Any idea(s)?

[Mattia]

Um, looks like a glue-on strip (scroll down to the picture next to the dime) that you apply to the edge of your fingerboard. LEDs embedded inside. Probably would annoy me, given my propensity for thumb-over playing...

[al heeley]

Neat idea if you like that sort of gimmick, but $61?!? I'd give it a go for $15 maybe. It's just a thin self-adhesive strip as Mattia says, you stick down to the top edge of the fretboard and run off a battery stuck to the rear of the guitar headstock. Maybe they can get one to play christmas tunes next.