Reusable Revolution Solar Powered LED Post Cap Light for 4 x 4 PVC Posts (White, 2 Pack) 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: 4" x 4" Post Size Fitting; these post caps will ONLY fit on 4" x 4" Vinyl, PVC or Plastic posts. The opening on the bottom of the post cap which fits over the top of the post is exactly 4 1/16" x 4 1/16". *** This post cap is not designed for use on Wooden posts! Energy efficient lighting solution  100% solar powered Long-lasting SMD LEDs provide better, brighter light than traditional LEDs Heavy duty ABS plastic construction is durable and can withstand the elements Set it and forget it! Dusk-to-Dawn timer means you only need turn the lights on once Designed to exclusively fit 4 x 4 PVC posts Lumen Brightness: 2 Light Color Temperature: 7500K Base Measurement: 4 x 4, made for 4x4 PVC posts Housing Material: ABS plastic Battery type: 400mAh AA Ni-Mh Working Time: 8 to 10 hours on full charge