I took this pic to post on a thread that seems to have gone so I will start one just for them.
These are a set of lights I got for my bike and they are so great. They are tiny, and you can ride with them in your pocket no problems. They attach to your bike with the elastic tail that just loops round anything and hooks onto itself. You can wrap them round any bike tube: handlebars, seat stays, seat post, where ever. They are rubbery so they stay put, and even tho they are so small and just LED, they really kick out a beam. They even have flashing or constant modes. At last, street leagal ... well, unless you ride brakeless!