* Glow In The Dark Crown Necklace * Available in colors: Blue, Green and Aqua. * Can be worn throughout the day. * A brilliant gift idea * In order to get the best result, place the necklace directly into sunlight or under a light source (UV flashlight, white bulb etc) should get you a beautiful glow. * When fully charged it will glow brightly for the first 40 minutes and after that it fades out slowly in the following hours. For easy to use, you can charge by your smart phone app "flashlight" so you can charge it up again in a matter of seconds when the glow wears out. * UV light or natural sunlight works best for any glow in the dark product.