Are you annoyed from your action camera that is not capable to record the things that happen behind you in a satisfying way? Just attach your camera to the GoPro plug, and you will still have your hands free for other things while you don't miss any moment that is going on behind your back.

If you don't want to be limited to only blue color then you can also choose from green or red. Just pick the file with the suitable look in the filename, and you will end up with an item in the color of your choice.