Perfect Reading Light for Bedtime Reading: The clip-on reading light allows you to adjust the light intensity by long-pressing the button on the back (approximately 3-5 seconds) to read at night without disturbing your partner who might be sleeping next to you. 3 Color Temperatures: The book reading light gives you 3 color temperatures (Yellow, White, Mixed) to choose from by pressing the button on the back, adapting to all circumstances for comfortable reading. Lightweight and Practical Clip: The LED reading light has a lightweight and practical clip, and the clip easily attaches to the book, allowing you to turn pages without disturbance and without leaving marks, nor does it damage the books. The opening size of the clip is 3 cm, allowing you to hold a maximum of 120 pages. Easy to Charge: The reading light has 2 small gray contacts at the bottom of the USB plug tab, allowing it to be connected to a USB power outlet, no need for an extra cable. It only takes 30-40 minutes to fully charge, and you can use it for up to 3 hours at most.