USB RechargeableBuilt-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). Brightness AdjustableSoft white glow. press the button to adjust 2 brightness levels (50%.100%). glare-free soft glow helps your avid reader kids enjoy reading without straining their eyes. Flexible for Reading on Bed350 flexible holder bends to any angle for your best viewing. LED lens can be swiveled 90 counter-clockwise. 90clockwise. and 45downward. illuminating both pages fully without disturbing bedmate. Compact & Lightweight1.37 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. Gift for BookwormsCompact size and multi functions. this reading 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.