GreenLighting 6 Pack Solar Power Square Outdoor Post Cap Lights for 4x4 PVC Posts (White) DURABLE CONSTRUCTION - Heavy duty ABS plastic casing is durable, designed to withstand the elements ENERGY EFFICIENT LED - Improved SMD LED provides brighter glow for better visibility 100% SOLAR POWERED - Top mounted solar panel charges the AA 400mAh Ni-mh battery, for an energy efficient lighting solution that requires no external wiring. LASTS FOR 8 - 10 HOURS - Once fully charged, these lights will provide 8 to 10 hours of illumination, for an evening full of ambiance PRODUCT SPECIFICATIONS - 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