PORTABLE & ULTRA SLIM- The thickness is only 5mm which makes it portable. The illumination is perfectly even, super bright, and flicker-free USB Powered: Comes with a USB cable, easily power the light box from any Computer, Power Bank or USB Plug that connects directly into a wall outlet.Working Voltage: DC 5V,Rate Power: 3.2W. The light is STEPLESS adjustable,so you can set it to to your preference.Eyesight-protected Technology:Flicker-Free super bright eco-friendly Led.Touch sensor Switch Design , turn on/off and brightness control easily just by slight touch.