Color Modes and 5 Brightness Levels: The clip-on reading lamp offers 3 color temperatures and 5 brightness levels (warm light 1600K, warm white light 4200K, cool white light 6000K), protecting your eyes and allowing you to easily adapt to different lighting situations and create a private reading space. Timer Function: The bedside reading lamp has a timer function. Press and hold the power button for 2 seconds to set a 30-minute reading time (the green indicator light turns on). Press and hold again for 2 seconds to set a 60-minute reading time (the blue indicator light turns on). Avoid wasting power by leaving the book light on all night. USB Charging: The night reading lamp has a built-in 500mAh lithium battery, and the charging interface is a standard USB charging port that can be easily connected to a computer, PC, power bank, etc. It takes 2.5 to 3 hours for a full charge and can provide up to 8 to 80 hours of reading time. This means that if you read for 30 minutes a day, it can provide up to 3 months of light. Flexible Angle Design: This bedside reading lamp can adjust the reading angle to suit your eyes. The lamp head can be rotated downwards at 45° and horizontally at 90° to the left and right, allowing for a more comfortable viewing experience. Lightweight at only 45 grams. Convenient and Versatile: This clip-on bedside lamp is small and lightweight, making it easy to carry anytime, anywhere. The book reading lamp can not only be used as a book light but also as a bookmark, making it a perfect gift.