As shown above pictures, the light spreads a warm glow throughout the bottle are pure and beautiful like the polar lights. But the light are’t come from LED, it comes from chemical reaction the same as fireflies. Simply, luciferase enzyme and oxygen under a series of complex chemical reactions produce light that is in the process of energy released. There are two kinds of liquid on packaging box, Liquid in plastic bottle and glass bottle. What you need to do just drops little liqudi from plastic bottle into glass bottle which will show the cool firefly light to you. More liquid more light and the shorter duration.
WARNING: Bottle of liquid only for watch, not edible. If it gets in contact with skin or eyes, use water to rinse.