Exclusive to OttLite the only desk lamp designed to break down harmful bacteria at the cellular level. Patented technology proven to continuously clean and sanitize your space. 3 modes ClearSun Only, ClearSun + Sanitizing, Sanitizing Only, Proprietary. Exclusive OttLite ClearSunLED, reduces eyestrain by 51%. Includes 5V, 2.1A USB port to fully charge smart phones and tablets. Touch controls with multiple brightness settings,Height adjusts from 11.75 to 21 inches with flexible neck. Base measures 4 x 6.625 inches.