The Ott-Lite Renew LED Desk lamp is big on healthy lighting technology! Reduces eyestrain up to 51 percent. Provides a smooth, uniform light with a CRI of 95. The maximum lumen output of 400 with touch-activated control. Six brightness settings, stylish faux leather texture, and chrome accents. Includes 5V, 2.1A USB port? fully charges tablets, phones, and more. LCD screen displays the date, time, and ambient temperature. Includes an alarm with battery backup to save settings in an event of power interruption. Height adjusts from 7.5 inches (19.05cm) to 14.75 inches (37.47cm). Base measures at 5.5 inches (13.97cm) by 7.25 inches (18.4cm). Ott-Lite proprietary Wellness Series LED. Comes with an AC/DC adapter (Input: AC100-240V, 50/60 Hz, 0.8A. Output: 27V DC, 1.0A with a Male DC plug). Can only be used in the U.S. and Canada.