Most Beloved Glow in the Dark Heart Pendant Necklace, Glow Green Light 100% brand new and high quality. The heart pendant measures 30mm*20mm. The necklace chain is 46cm long. Any light will charge the powder. However, direct sunlight, high wattage bulbs, or black lights are needed to obtain the maximum glow. The glow will gradually fade until recharged. A Perfect holiday and birthday gift for you and love one. Great Accessories for Halloween, Thanksgiving, Party, Festival, and many more.