GLO rings are made from a mixture of resin and phosphorus glow powder.
The glow will remain visible for several hours after it's charged
Your ring will charge every time when it's exposed to any source of light, including daylight!
Your ring will absorb energy when it's exposed to any source of light, including daylight. The best way to power them up is a small UV flashlight but even a regular Mag-lite will do. After absorbing enough power, the rings glow in normal light as well!