Material: ABS, product size: 105 * 36.5 * 15.5mm, built-in 500msh battery, USB charging NOTE: DO NOT turn the light head hardly to left or right beyond 90, as it contains an electricity cord inside. UNIQUE TIMER&ENHANCE READING COMFORT: The reading light built-in 30/60-minute auto off timer, it can select 30-minute in green light mode or 60-minute in blue light mode, ensuring you never forget to turn off the light after a satisfying reading. The book lights for reading at night in bed equipped with 9 advanced LED beads, emits an even glow across the pages without flickering, shadows or glare that won't strain your eyes, even during marathon reading sessions. 3 COLOUR MODES & MEMORY FUNCTION: This book reading light features 3 colour temperatures - amber light (1600K), blended light (4000K) and white light (6000K). Amber light blocks 99.99% of harmful blue light, protecting your eyes during long reading sessions. With 5 adjustable brightness levels, you can set the brightness that's right for you. The reading light has a memory function, so the next time you turn it on, it will be your preferred light color and brightness, don't set it again! FLEXIBLE ANGLES & SECURE CLAMP: The clamp of book light clip on can open maximally 150. The light head can be turned left, right, and downside with angles of 90, 90, and 45 respectively, adjust the light head to your preferred angle. The clip boasts a generous width, ensuring a strong and reliable grip on all types of books. The clip of book light clip on is designed to be gentle on your cherished books, leaving them unscathed even you removaling. CONVENIENT RECHARGEABILE & REAL-TIME BATTERY UPDATES: The book lights for reading at night in bed has 500 mAh battery, enjoy an impressive reading time ranging from 8 to 80 hours, depending on your chosen brightness level. The rechargeable book light can be charged directly into any USB port, such as laptops, mobile power, and adapters. don' t need charge cable. You can stay informed about the battery remaining status with the help of the intuitive 4-power indicator lights. LIGHTWEIGHT & PORTABLE DESIGN: This reading lights for books in bed weighs only 1.37 ounces (39g). When you clip it on a book, you can barely feel its weight. Its small and flexible design makes it easy to carry and put into a backpack, taking up very little space. It's perfect for reading in bed at night, at home, while traveling, on airplanes or trains, in cars, etc.