High Performance solar lights stays lit for up to 12 hours Lights up automatically every night / auto - off switch High output surface mount LED technology for brilliant white light 3x brighter than standard LEDs 2 long life AA Ni-MH rechargeable batteries included Durable White Vinyl (PVC) Will fit over an actual 4x4 or 3.5x3.5 post (3.5x3.5 adaptor included) Quick and easy Do It Yourself installation. 12 Lumens / 4500 5500 Kelvin Patent No: D580,581S