2-pk Garden Solar Post Deck Cap Square Fence Lights 5 LED Material: Premium Heat-Resistant Plastic Mounting Bases (Inside Diameter): 3.75" X 3.75" (Solid Wooden/Composite Post) OR 4 1/16" X 4 1/16" (Hollow PVC/Vinyl/Plastic Post). (PLEASE GIVE US YOUR SIZE) Operating Time: Up to 8 Hours (depending on weather, temperature, regions and sunlight availability) Light source: 5 Ultra Bright White LEDs Automatic on at dusk, off at dawn (on/off manual override switch)