The OttLite LED Cobra Desk Lamp features three color modes (warm light, cool light and natural daylight) to brighten your work area. With a graceful arching design, the LED Cobra Desk Lamp twists and flexes to easily direct light over a wide area. An illuminated control panel lets you adjust brightness at the touch of a finger and a built-in USB fully charges your tablet and smartphone. With its sleek and innovative design, the LED Cobra Desk Lamp is perfect for offices, dorm rooms, countertops, end tables, and more. With OttLite you can see details clearly and reduce glare & eyestrain so you can do what you love, longer. Height adjusts from 23-3/4 in. (60.3 cm) to 9-1/2 in. (24.1 cm). Base diameter 6-1/2 in. (16.5 cm). Some assembly required.