Yep, seen these... These are for when you are wearing it on your hat so you can tell if it is still recording because you can actually see the led light which is channeled down below the cap brim... Cool idea! :-)

I have it on my Go3, and it is a life saver. So useful.

Very clever!

Wow that's dedication!

I don’t think I’d use them without those rear indicators. The battery life is just so limited