White Solar LED Post Light Cap 4.5" x 4.5" for Bridges, Fences, Decks, & Posts No Wires, No Electricity, & No Hassles! Easy to install and maintain Light up your deck or porch day and night Two AA Ni-Cad Rechargable Batteries ensure longer lighting power up to 12 hrs of light Use the included three adapters to fit an actual 4.265" x 4.265", 4" x 4", or 3.5" x 3.5".