Just got this set, because I am going to a mascarade ball. I am going to attatch them to my mask for an awesome effect. They are wired to a small battery pack that you can easily clip into your hair. The set also comes with a clip for the battery pack to you can clip it into your hair or collar. It has 7 different modes, so you can leave it on one or surprise your friends by swithching it when they aren't expecting it. Lots of fun!