These copper solar fence post caps are perfect for adding a glow to your fence post line or deck railing with a warm white LED, energy saving as powered by the sun. Made of high quality anti-heat plastic, these lights will last for years to come. With a big 10mm warm white LED and our newest solar panel, these lights will provide 2x the brightness and a longer run through the night. Operating time is up to 10 hours, depending on weather conditions. - Sun powered, wireless, simple installation - Light source: 1 warm white 10mm LED - Outer material: heat-resistant white plastic - Operating time: Up to 10 hours, depending on weather conditions - Pre-installed 1.2V 600MAH rechargeable AA battery - On/Off switch (for testing and storage purpose. Must be on for initial use) - Fits 4 X 4 wooden posts and deck rails: see rules*** *** Wood/Composite posts: measured smaller than 3-13/16" square *** Hollow Vinyl/Plastic posts: measured inside opening larger than 3-15/16" - Base dimension: 4" (L) X 5.5" (W) X 4.5" (H) - Top dimension: 5.5" (L) X 5.5" (W) X 4.5" (H)