12 Constellation Necklace Starry Sky Luminous Zodiac Glass Ball Pendant Necklace Christmas Gift Glow in The Dark

how to glow in the dark：the picture inside the product is made of fluorescent material. If you put it directly in the dark， it will not emit light. The correct way to use it is：put it in the dark and illuminate the product with a flashlight or light  for 10 seconds， make it absorb the light， then turn off the light， you will find it glows in the dark