Note: The Main Raw Material of Luminous Products Is Light Energy Storage Luminous Powder. after the Light Is Exposed to Natural Light, Sunlight Light, Ultraviolet Light, Etc., the Light Energy Is Stored. after the Light Is Stopped, it Is Slowly Released in the Form of Luminous, So It Can Still Be Seen at Night Or in the Dark, Lasting for Several Hours to More than Ten Hours. So Please Try Your Best to Let It Show outside to Absorb Light after Receiving It. Don't Have Something to Block It. Can Be Recycled. (You Must Absorb the Sunlight before You Can See the Luminous Effect in Dark Places)