I will take more pictures tomarrow when its daylight out.
The audio jack is for my "system" lol.
I mounted a detachable portable jogging radio to the handlebars so i can listen to some music, but the problem was the earbud wire went from my head to the handlebars and was real awkward riding and when i looked back they would rip out my ears. sometimes i forgot about them and when i got off.. well it didnt feel to good under the helmet.
I snagged a 12' (the only length we carry) 3.5mm audio extension from work.
i ran it from the top of the tank down to the bottom where it meets the seat, that way i can plug in my earbud lower and closer to me instead of the handlebars. Now i can look as far back with no problem and when i forget about it and get off the it just gracefully unplugs and doesnt rip out my hears.
i get static sometimes not sure if its the cheap radio or some kind of interferance. its new and i have more experimenting to do.