My friends and I have had so much fun utilizing this clever product.  Cascading strands of fiberoptics that are lit with a little colored LED in the base.  They are built onto a hair barret, and you can clip them in your hair, clip them to a hat band, or clip directly onto your feather plumes, as they are very lightweight.  They are great at evening events, convention parties, anywhere that darkness is an asset.  They come ready to use and will light for approximately 10 hours on the 2 batteries inside.  You can save battery by sliding the battery case open to turn off when you are done using, until next time.  The colors are solid, not blinking, except the rainbow is color changing, rotating through all the colors.  We also carry the batteries for replacement.  The plumes each take 2 batteries, but the battery packs come in sets of 5.  For that I am sorry.