... 24 hours .Storage life:up to 2 years .Non-toxic, non-flammable, non-radioactiv .CE,EN71,ASTM Certificate SVHC,SGS , ... 50/31*21*24PrincipleNo heat, flame and sparks, no battery requiredAdvantageNon-toxic, non-flammable, non-radioactive, waterproof, windproof Usageconcert, dance ... clients to visit our factory, and build happy long cooperation. glow stick flower kinds of colors and glowing in the dark