8 Pack Solar Powered Copper Outdoor Garden Deck Patio Fence Pathway Post Light for 4x4 Wood Posts Smooth & durable weather resistant surface is perfect for handling the natural elements Brilliant white LED bulb has a life expectancy of over 100,000 hours Each light includes a 600mAh AA Ni-Cd battery that's recharged by the natural power of the sun 100% Solar powered no external wiring necessary Product Dimensions - 5.75" x 5.75" x 4.5", Base Dimensions: 3 7/8" x 3 7/8" Post Size Fitting; these post caps will ONLY fit on nominal 4" x 4" wood posts. The opening on the bottom of the post cap which fits over the top of the post is exactly 3 7/8" x 3 7/8". *** This post cap is not designed for use on Plastic, Vinyl, or PVC posts!