Color modes and brightness Three color temperatures (50% warm white, 100% warm white, 50% daylight, 100% daylight, 50% cold light, 100% cold light) and nine brightness levels. This combination provides comfortable illumination and supports a variety of reading needs while allowing you to create a lighting environment without disturbing others. USB rechargeable Built in USB charging. Just plug into a laptop, power bank, adapter, car charger, or USB socket to charge. The 200 mAh lithium battery charges in about 1.5 hours and lasts for about 8 hours at typical brightness settings. Compact and portable Mini size and lightweight design for easy transport. Clip onto a book for nighttime reading. Fully foldable and flat, suitable for reading on an airplane, train, or in the back seat of a car. Product size: 4.32 inches long and 1.8 inches wide. Flexible lighting angle Fully flexible design. The LED lens can rotate 90 degrees left and right and 45 degrees downward in the horizontal direction. The 315degree flexible bracket can be bent to any angle, providing an viewing experience without constant repositioning. Use scenarios Reading in bed at night without disturbing others. Reading on a plane, train, or in the back seat of a car. Working on a dim desk or laptop where others are nearby.