Our funky luminous covers come with a free science lesson to ensure you get the best experience from your new cover! If you didn't already know... things that glow in the dark (or are "luminous") contain a substance called phosphor, which is capable of radiating light after it has become energized. Such substances first soak up energy for long periods when exposed to light and subsequently radiate visible light in the dark. Therefore, in order to ensure that your phone cover glows in the dark to the best of its ability, please ensure it is exposed to visible light for a significant period of time before venturing into a dark room and expecting it to glow. Also, please give it approximately 5 minutes once you have ventured into the dark for it to start glowing. Features: - luminous "glow in the dark" cellphone case - unique galaxy design What's in the box 1 x Luminous Galaxy Phone Case - iPhone XS