I put mine on the handle bars, but then mover it behind the head light to keep it away from the weather.
Make sure you do it off an ignition live.
One of my friends connected it to the battery and it was dead flat in 3 weeks.
That's the usb adaptor.
I have just bought one of these that I am going to mount under the pillion seat , I was going to mount it at the front but it looked a little bit big for my tastes.I will then run a usb extension up to the front to power my sat nav. I will have to water proof the end of the extension near the front it in some way but I have already thought of some Ideas on this.
Not got a picture of the outlet but on mine its a small white connector in the headlight that has nothing plugged into it and it is switched with the ignition, but I also put an inline fuse in with the socket