Echo Valley 4429 1-Piece Mushroom Luna-Sol LunaLite, 4.5 by 4.5 by 16-Inch Decorative solar powered accent light; Solar panel recharges the AA Ni-MH battery that comes standard with each unit Embedded luminescent crystals in the orb glow naturally on their own Light detecting sensor in the solar panel automatically turns light on at dusk and off at dawn Suitable for any walkway, pathway or outdoor landscape Do not expose to extreme temperatures and bring product inside during the winter