I want to show you how I made bike wheel valve cap lightning using mini jack 3.5 as base. It's realy cheap than the same stuff in store. And it's a very small but very COOL device for bike. Now everybody can see me riding a bike in the dark time. I made just one piece for rear wheel and I'm going to make another one for front wheel (when I buy some LEDs). OK. Watch the video. Do the same. Do it better than me. And enjoy!
I don't know why the light on gif is red(maybe converter bug). But the light is blue as on the picture.