Our low profile 4"x 4" Windsor Vinyl solar post cap includes four high output surface mount LED's that are hidden from view, but as night falls this one of a kind patented design casts an array of light onto all four walls of the post cap and surrounding area...a truly exceptional style only from Classy Caps Mfg. Will fit over an actual 4"x4" OR 3.5"X3.5" post. (3.5"X3.5" adapter included) High Performance solar lights - stays lit for up to 10 hours Casts a brilliant white light downward onto the outside walls of the post cap and surrounding area Lights up automatically every night / auto-off switch High output surface mount LED technology 3x brighter than standard LEDs 1 long life AA Ni-MH rechargeable battery included Manufactured from durable White Vinyl ( PVC) - won't fade or yellow Will fit over an actual 4"x4" or 3.5"x3.5" post. (3.5"x3.5" adaptor included) Quick and easy Do It Yourself installation. 10 Lumens / 4500-5500 Kelvin Patent No: 6,581,335 B2 Download our Installation Manual