Intelligent Energy Control System: No matter how the remaining battery capacity changes, the brightness of the lamp remains the same. The intelligent energy control system helps our lamp maintain constant output. Flexible Gooseneck: The bendy neck allows you to bend and twist reading lamps for the bed into the exact position you required. The sturdy clip with padded can securely fit the led clip-on light onto the bed frame, tables, desks, bookshelves, headboards. Different Colors and Luminances: The book light has 3 different brightness and color grades. You will have a strong beam suitable for work or study, a soft light suitable for reading, and a soft night-light suitable for sleep. Equipped with Battery: The desk lamp is equipped with 30 LED bulbs and a 1200mAh long-life battery. The unique matte lampshade design and soft light are good for your eyes because they will not flicker or produce negative radiation. Memory Function: remember the brightness last used. When turned on again, the light will return to the previous setting. It can provide full power for 6 hours under the highest brightness and up to 20 hours of power under low light, which is convenient.