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It is necessary for customers to provide pure oil for the essence of water Main ingredients: light energy storage night powder (environmental fluorescent powder) Principle: low phosphor under natural light, solar light, ultraviolet radiation, store energy, after the stop light, slowly release in the form of fluorescence Use: decoration, advertising, warning signs, etc Color: (yellow green, blue, red, purple) It absorbs more light, brighter and longer Absorb light, light storage and light process can be recycled indefinitely. This product is non-toxic, harmless, non-radioactive material, no energy consumption, no maintenance, safe and reliable.