Echo Valley 4377 Illuminaire Anemometer Windvane, 11 by 15 by 53.75-Inch Multiple wind cups catch the wind on a gusty day and rotate via perpetual motion measuring the winds speed Kinetic metal sculpture that glows in the dark; Perfect for flowerbeds, large container plants and gardens Luminescent crystals in the hand-blown art glass globe absorb light energy during the day and release it at night in the form of a subtle green glow No tools required for assembly/disassembly Weather resistant electroplated painted copper finish will withstand the elements and provide years of use and enjoyment