USB Rechargeable Built-in USB in the base of the light, no additional cable needed. Directly plug it into a computer, power bank, wall outlet, adapter, car charger etc. 1.5 hours charging lasts up to 8 hours (at brightest setting).Compact & Lightweight 1.37 ounce, lightweight and small, ideal for clipping on a book when nighttime reading; can be completely folded flat and slim, portable for reading on airplane, train, or backseat of car when travelling.Flexible for Reading in Bed 350 flexible holder bends to any angle for your best viewing. LED lens can be swiveled 90 counter-clockwise and clockwise, and 45downward, illuminating both pages fully without disturbing bedmate.Brightness Adjustable Soft white glow, press the button to adjust 2 brightness levels(100%,50%), glare-free soft glow helps your avid reader kids enjoy reading without straining their eyes.Gift for Bookworms Compact size and multi functions, this book light is a good present for avid reader kids who love to read anywhere and everywhere. Can be also used as a bookmark or mini flashlight when power blackout