I have a modular helmet so I add longer strips on the top and smaller strips on the side to make it work. I cut longer strips at the front so I have to go back and straighten the cut. For a while I didn't know what to do with the little control box, but I ended up trimming a tiny piece of rubber at the back neckline to fit the clip on the helmet. It makes an odd howl when the lights are on, but that's not a rule-breaking thing to me because there's a lot of other noises anyway. It really helps me stay safe it's so bright. Powered by 2 AA batteries, I don't remember if this is stated in the description. I will probably order a set for every helmet I get in the future.
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