3 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 for yourself. Timer Function: The bed reading lamp has a timer function. Press and hold the power button for 2 seconds to set a reading time of 30 minutes (the green indicator light will appear). Press and hold again for 2 seconds to set a reading time of 60 minutes (the blue indicator light will appear). Avoid wasting electricity as the book light is on all night. USB Charging: The night reading book light has a built-in 500mAh lithium battery, and the charging interface is a standard USB charging port, which 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, meaning that if you read for 30 minutes a day, it can provide up to 3 months of light. Flexible Angle Design: This bed reading light 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 more comfortable viewing. It's lightweight, weighing only 1.57 oz (45 grams). Convenient and Versatile: This clip-on bed light is small and lightweight, making it easy to carry anytime, anywhere. The book clip reading light can be used not only as a book light but also as a bookmark, making it a great gift.