Echo Valley 4425R Oblong Luna-Sol LunaLite, 6-Inch by 6-Inch by 17-3/25-Inch Weather-resistant electroplated finish will withstand the elements and provide years of use and enjoyment State of the art photo-voltaic technology combined with beautiful luminescent hand-blown art glass Light passes through the glass and is absorbed by the solar panel, which in turn charges the battery that is included At night, the UV LED light supercharges the luminescent crystals inside the glass lamp amplifying the glow intensity and duration No assembly required Solar enhanced glow in the dark Concealed solar panel recharges the mini AAA Ni-Mh battery that comes standard with each unit UV LED light supercharges the luminescent crystals in glass lamp at night amplifying glow duration and brightness Light detecting sensor in the solar panel automatically turns light on at dusk and off at dawn Do not expose to extreme temperatures and bring product inside during the winter