Ryham USB Desktop Lamp Touch-sensitive Control LED Eye Care Cool/Warm/Natural Lighting for Dormitory Study Bedroom Reading, Gray) Eye-Protective:Latest surface lighting source and innovative light guide panel help to create a flicker-free, anti-glare light without ghosting. Touch-Controllable:Slightly touch the button, and you can easily adjust the light intensity from warm white, white to cool white. Portable and foldable elegantto carry anywhere you like with its small compact. Energy-saving, after charging built-in 2000mAh Battery full, you can use it for 30 hours in sleeping mode. And this Ryham LED bulb features long lifespan up to 100000 hours and conductors small faulty rate. Excellent customer service: If you have any questions, do not hesitate to contact us directly. We pursue 100% satisfaction shopping experience and exceed it.