1. Blocks 99.94% of blue light to give you better quality sleep Studies show that using amber spectrum lamps could block 99.94% of blue light and transmit signals to the body to encourage the production of melatonin, the sleep hormone, which reduces eye fatigue and greatly improves your SLEEP QUALITY after reading or working at night. Perfect for book enthusiasts, children, office workers, artists po^2. 3 Adjustable Amber Brightness Modes You can adjust the brightness in 3 levels according to your needs: Low, Medium and High, by pressing the button on the top of the lamp. Press once for soft lighting (20 lumens), twice for bright lighting (40 lumens), three times for brighter lighting (80 lumens), and a fourth time to turn off the lamp.^3. USB charging and battery level indicator Built-in 1000mah rechargeable lithium-ion battery and USB port. This lamp can last up to 60 HOURS without charging (in low light mode), and it doesnt take much time to fully charge. This book light also has a battery level indicator, which allows you to check the battery usage status at any time.^4. Adjustable arm and clip pad Thanks to the flexible adjustment of the gooseneck, the lamp can be folded 360 degrees to any desired position. Its lightweight design makes it easy to carry, even when traveling. The sturdy clamp allows the reading light to be placed independently, and it can also firmly clamp e-readers, books, shelves, etc. It is suitable for use in many places.^5. Compact and Lightweight It is light enough to fit your e-readers, books, computers, music stands, childrens readers, etc. Read with pleasure before bedtime. Enjoy a pleasant read before bed, while getting high quality sleep without the interference of blue light.^