Feature: Can be absorbed any kind of light It could be used over and over again. Glow lasts approximately two to three hours after full sun exposure High brightness, long life time expectancy Environmental friendly material,no radiation, non-toxi Pebble style, perfect for decoration
NOTE: 1. Please place the stones under the sun to receive sunlight for more than 3 days. 2. After being exposed to strong daylight with 3 hours, these pebbles can be lighted within 1-2 hours in the dark.