iGlow Solar LED Post Cap Lights 5 x 5-Inch, Copper, Pack of 8 These Lights will Only Fit 5" x 5" Posts. Not 4" x 4". Please Measure your Posts before Purchasing. 1 Ultra Bright White LED. Last up to 100,000 hours. Pre-installed Rechargeable AA Battery, Last up to 2 Years Before Replacing. Automatic Sensor Activates at Dusk with NEW and IMPROVED Solar Panel for Superior Charging Performance Weatherproof  Designed to Protect the Lights from Natural Elements Easy to Install. No Wiring Required. All Fence Post Attachments and Parts are Included. Dimensions: 6 (L) x 6" (W) x 4.5 (H). Base Dimensions: 5" (L) x 5" (W).