CHEEKON 4 X 4, 5 X 5, 5.5 X 5.5 or 6 X 6 Solar Post Cap Lights, Metal and Glasses, Bronze, Wood Post Fence Post Cap Outdoor Garden Yard Deck Street Top Wall (3.5 Inches) NOTICEIt need install in 4*4 inches wooden posts  but the top of wooden posts need to be trimmed down to 3.5*3.5 inches SOLAR POWERED - these post cap lights utilize the free natural power of the sun to operate. A Single-Si solar panel absorbs light during the day and recharges the Ni-MH battery (included) for use in the dark eliminating your need to swap out batteries or install a costly outdoor power system. LASTS FOR 8 - 10 HOURS - Once fully charged, these lights will provide 8 to 10 hours of illumination, for an evening full of ambiance ENERGY EFFICIENT LED - LED provides brighter glow for better visibilitye . DURABLE - CHEEKON Company takes pride in providing some of the hightest products ih the solar industry . These lights are features a metal and Glasses that have been designed to handle the outdoor elements for years to come .