Feature：All our jewels do not contain nicke l and resolve any allergic reaction.Can be used repeatedly.The light will dim slowly, it will not turn on at night. So it will not light up, then it will light up in the sun or light exposure, then it will continue to shine!Delivery: 1 x pendant with chainPlease put the necklace where the sun shines, or U-V light exposure continues for 5-10 minutes, then get a dark place, it can shine!Material: alloy (pendant), copper (chain).Package：1X necklaceVery elegant necklace, A beautiful matching necklace would be a perfect party for your dress.Gift gift for Christmas day, birthday, Valentine's day and the birthday of your girlfriend, wife and mother.