Glowing Star Wall Sticker (Pack of Two)Condition: Brand New Material: Plastic Color: Multi Colour Feature: 3D Sticker Scenarios: walls, ceilings and any smooth surface This Photoluminescent Pigment is environmentally friendly It adsorbs light and glows in the dark. So you must put it in the sun to absorb much light. Or you can also turn on the lights to let it absorb enough lamplight. When you turn off the light and go to bed, it will glow in the dark