Product style: Christmas<br> Gender: children necklace<br> Pendant Size: 3.5cm * 3.0cm<br> Chain: 45cm<br> Material: Copper, White Gold Plated<br> Weight: 10g<br> <b>Package Include:</b> <br> 1 x Luminous Necklace(Blue); <br> 1 x Luminous Necklace(Deep Blue); <br> 1 x Luminous Necklace(Yellow-Green); <br> 1 x Luminous Necklace(Purple); <br>  <br> If there are often exposed to sun, it will glow in the dark, <br> If stay in a dark place for about 30 minutes, it will stop shining, you may beam it with your mobile phone lamps or the sun, it will have a bright light again back to the dark, Because of the exposure time is different, the brightness may deep or shallow, so the more light is absorbed, the brighter it appears. <br>  <br> <b>Warm tip:</b> if your necklace doesn't glow when you get it for the first time, Pls let it be shined In the sun for a while, then put the necklace in the dark, you will find a wonderful changes! <br>