Amber and Warm White Light1800K amber and 3000K warm white light, 2 light colors provide the brightness you want, the upgraded amber book light can block 99.95% of blue light, effectively protect your eyes from blue light damage while reading.USB ChargingBuilt-in USB for easy charging, plug directly into your laptop, power bank, adapter, car charger or USB socket for charging, no need for extra cables; 200mA lithium battery, 1.5 hours charge lasts about 8 hours (at brightness settings); no more wasting money on batteries.2-level Brightness 50%, 100% brightness is optional, the LED reading light can be adjusted to 2-level brightness through the button; short press to switch the brightness, long press to turn off the book light; brightness memory function , maintain the previously selected brightness level.Flexible Reading LightCan stand alone or clip on a book; LED lens rotates 90 counterclockwise, 90 clockwise, 45 down; 315 flexible stand allows you to focus the light exactly where you want desired location.LIGHT & PORTABLESmall and lightweight, perfect for gift giving, clip on book for night reading; fully folds flat and slim, easy to carry and read in the back seat of a plane, train or car while traveling.