During the day, these energy-efficient solar 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. Solar fence post lights add ambience to any outdoor setting including decks, patios, and swimming pools.

The opening on the bottom of this fence post cap light, which fits over the top of your post. The base opening has two sides and thus serves two functions. Inside diameter of one side is 3.75" (good for Solid wood/composite posts) and inside diameter of other side is 4 1/16" (good for Hollow PVC/Plastic/Vinyl posts).

Material: Weatherproof – New Nano ABS material . Ultra Long Lasting White LED Bulb. Rechargeable Ni-Cd AA battery and 2 screws included

Each cap light has "On/off" manual over-ride switch. Light turns on automatically when dark.