Designed specifically for steel and aluminum posts. High Performance solar lights stays lit for up to 10 hours Lights up automatically every night / auto - off switch High output surface mount LED technology for brilliant white light 3x brighter than standard LEDs 1 long life AA Ni-MH rechargeable battery included Manufactured from durable cast aluminum with White powder coated finish Adapters included to fit over an actual 2.5x2.5, 2.25x2.25 or 2x2 post Quick and easy Do It Yourself installation. 10 Lumens / 4500 5500 Kelvin Patent No: D624,227 S