My friends and I have had so much fun utilizing this clever product.  Every year the Pirates of Portlandia march in the Portland Starlight Parade, where you are required to wear clothing that lights up.  Our big discovery this year was the Fiberoptic Plume.  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.  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.