Smart Protect Battery: Lithium protection function, effectively prevents overcharge, over discharge or short circuit. USB Port: Upgraded design, only need to pull out either side of the lamp head, exposing the USB charging head to charge. Charging can be completed anytime, anywhere, no additional data cable is required. Lightweight and Convenient : The bendable book light doesn't require much space and can fit easily into your carry-on suitcase, making it convenient and flexible from all aspects. This flexible neckband hug light helps you just focus on what you are doing, whenever for reading in bed or in garden, patio, walking dog, repairing, crafts, Specifications: CRL: 90 LED beads: 8 Luminous Flux: 90LM Color: Black Shine way: Gradient,Adjust the brightness arbitrarily between 15-100percent Color temperature: 3000-7000K Material: rubber built-in lithium battery Charging time: about 80mins(full charge) The LED indicator light is on when charging, and it will go out automatically when it is full. Battery capacity:3.7V Discharge time (after full charge): about 6hrs (Highest Brightness Level); about 10hrs (Lowest Brightness Level).