The reading light has 3 colors x 3 brightness settings for a total of 3 LED bulbs and 3 brightness modes. Long press the switch button to select 3 different color modes according to your needs, and short press to adjust the low/medium/high brightness of each color mode to meet your needs for reading, working, sleep and others. Built-in high capacity rechargeable battery and micro USB port, a universal USB charging cable is included in the package, so it can be charged from a laptop /computer, power bank, phone charger, car USB drive, etc. No negative radiation, no dizziness, no shadows, no of flicker. Provides natural soft light that won't strain your eyes even after prolonged use. Enjoy your reading time without disturbing your partner or roommate. Upgraded 360° foldable gooseneck better solves the vibration problem and won't wobble when moving the book. Its small size and compact design also make it easy to carry, the sturdy notebook can hold e-readers, books, shelves, etc.