Color changing LED desk lamp offers 3 levels of lighting, from warm light to cool light to natural daylight (3,000K, 4,000K and 5,000K.) This helps people select the color that is best suited for their needs. Dimming feature controls brightness, with a maximum of 500 lumens. Flexible arm and head adjusts from 24" to 9" in height. A built in USB port on the base is great for charging personal devices like smartphones and tablets.