High Performance solar lights stays lit for up to 12 hours Casts a brilliant white light downward onto the outside walls of the post cap and surrounding area Lights up automatically every night 4 High output surface mount LEDs 3x brighter than standard LEDs. 2 long life AA Ni-MH rechargeable batteries included Manufactured from durable Tan PVC (Vinyl) wont fade or yellow Will fit over an actual 4x4 post Quick and easy Do It Yourself installation. 15 Lumens / 4500 5500 Kelvin Patent No: 6,581,335 B2 No: D460,570 S