Technically designed for use indoors, the Illuminarie Critters Pot Stickers are just at home outside in any plant, fairy garden, container garden or hanging basket. Luminescent crystals inside the glass marble absorb light energy during the daytime and release it at dark in the form of a soft green glow. Glow duration can last up to 3 or 4 hours, gradually fading over that period of time. These little garden decorations have an electroplated antique copper finish in order to protect from the elements. They can also be used as a support for young plants!