Item Type: Book Light Material: ABS Weight: Approx. 64g/2.3oz Product Length: Approx. 305mm/12.0in Built in Battery: Ternary polymer lithium battery 450mAh (included) Light Source: Warm light, white light and natural light (three colors can be switched) Working Duration: about 5 to 15H (depending on the brightness) Charging Time: 60 minutes Function: Long press to stepless dimming Charging Mode: USB micro 5V 1、Adjustable: The book light adopts the most advanced SMD LED. The lighting area is 3 times that of ordinary LED lights. Click to switch the light and long press to stepless dimming.  2、USB Rechargeable: The reading lamp is equipped with a rechargeable 450mAh lithium ion battery, including USB micro cable, compatible with mobile phone charging head, computer, and power bank for charging.  3、Eye Protection: Provide a natural and soft light which will not stimulate your eyes even after long hours of use. Enjoy your reading time without disturbing your partner or family.  4、Clip On Design: The light with a clip base, easy to use, stable clip on the desktop or book, suitable for night reading, learning, knitting, etc.  5、Flexible Neck: 360 degree bendable goose neck can be rotated to any angle you want, small and lightweight, convenient and practical to use.