USB Charging Port (5V, 2.1A) OttLite provides a powerful 5V, 2.1A USB charging port that ensures full charging of tablets, phones and other devices. Height Adjustable Height adjustable – shade and counterbalance arm with turnkey to lock lamp in desired position. Height adjusts from 4 to 18 inches. Touch-Sensitive Switch Easily change color modes and brightness settings with the touch of a finger. One switch controls all light functions providing simple operation. 3 Color Modes Warm White, Bright White and ClearSun Natural Daylight, each with 3 brightness settings Warm White 2700K Similar to the color output of traditional Incandescent light bulbs, warm white mode is a good choice for ambient lighting. Not good for reading or activities requiring focus. Bright White 3500K Bright white color mode is a good choice for ambient lighting, light reading, and when activities require occasional focus. ClearSun Natural Daylight 5000K Excellent for reading, color matching, and focus. Shown to reduce eyestrain by up to 51%, OttLite’s ClearSun LED is the healthiest LED lighting available. Healthier by Design Eyestrain is far more prevalent than we think – 3 out of 4 people suffer from it every day. Itchy, burning, fatigued eyes are key indicators that we are not using lighting that is healthy for our eyes. The OttLite Wellness Series with ClearSun LED technology is the gold standard for balanced light to help you see and feel better. ClearSun LED technology is the first of its kind and only available from OttLite. This revolutionary LED formulation provides unparalleled light output, closer to the sun’s natural spectrum than other LED lights available – reducing eyestrain and delivering advanced color rendering.