Fusion Solar Post Cap & Step Light Fencing Set for 4x4 Wood Posts (Bronze, 6 Piece Set) Internal sensor automatically turns the 6 Lumens LED light off and on based on surrounding light Monocrystal solar panel absorbs sunlight during the day for up to 8 hours of light at night Post cap fits standard 4x4 wood posts. Post actually measures 3.63" x 3.63" Pack includes 4 Wall Lights, 2 Post Lights, batteries, and mounting hardware. No external wiring required Post Light measures 5.875" x 5.875" x 3.25"; Wall Light measures 3.75" x 2.25" x 4.5"