During the day, these energy-efficient Atlantic Solars™ lights harness sunlight energy to charge their internal Lithium Battery. At night they automatically turn on, emitting a bright glow for your fence post line. Each Atlantic Solars™ light is made of Premium Heat-Resistant Plastic for years of use. With our Newest & Improved Solar Panels, a 3.2V Lithium Battery, and 5 Ultra Bright LEDs, its output is virtually unparalleled. Its newest Solar Panels ensure longer illumination (up to 6-10 hours), while the 5 LEDs and 3.2V Battery brighten the light output by 13.3x! Atlantic Solars™ 5″x5″ FINISH Fence Post Cap Solar Light Pre-Installed 3.2V Lithium-Ion Battery Light source: 5 Ultra Bright LEDs Solar panel: New & Improved For Superior Charging Material: Premium Heat-Resistant Plastic Color: White color Operating Time: Up to 10 hours (depending on weather, regions and sunlight intensity available) Safe & Weather Resistant Dimensions : 5″ (L) X 5″ (W) X 4″ (H) Designed to fit on 5×5 Hollow Vinyl/PVC/Plastic or Solid Wood/Composite Posts 5×5 Combination Mounting Base for 5×5 model has two sides and thus serves two functions. Inside diameter of one side is 4.75″ (good for wood/composite posts) and inside diameter of other side is 5 1/16″ (good for PVC/Plastic/Vinyl posts) Solid/Hollow….