SIZE;20cm
Glow stick light principle:
Glow stick accept natural light, fluorescent light, ultraviolet light irradiation, then the energy will be Stored.
After stopping the light irradiation, the energy as fluorescent way slowly released , so at night or in a dark place, can still see the light, it lasted for several hours to ten hours.
when you receive it , try to make it exposed to absorb light , do not cover it. Only after absorbs the light, it can luminous. The more light it absorbs, it will be fluorescent longer
