* AGT™ Professional-Grade Landscape Glow Stone Pebbles create a unique night glow effect unlike any other type of battery or electricity-based ambient lighting solutions.
* These glow pebbles are for decorative purposes and should not be set in concrete as their surface is too smooth which may lead to glow pebbles popping out of concrete.
* Charging Time: 8 minutes of exposure to daylight and these glow stone will glow for 10 hours.
* Lifespan: 20+ years.
* Glow Degradation: 1-2% per year. For example: In 20 years, they will still glow at 60%-80% of the original luminosity.