Item Type: Book Light Product Total Length: Approx. 385mm / 15.16in Built in Battery: 450mAh ternary polymer lithium battery. Light Source: White light, warm light and natural light, three colors can be switched. Working Duration: About 3-15H, determined by brightness. Charging Duration: 80 Minutes Material: ABS, silicone. Function: Long press for stepless dimming. Charging Method: USB Plug Weight: 67 g / 2.36 oz(approx.) 1、Bright Lighting: The book lamp adopts SMD LED light with 3 color temperature, and the lighting area large enough for your book reading.  2、Smart Adjusting: Click to switch lights, and long press for stepless dimming, so the book light will meet your various needs for lighting.  3、Good Clamp Base: Clip base design can firmly clip onto the desktop and book, meanwhile the soft lighting can offer better eye protection.  4、Simple Charging: The reading lamp is equipped with a rechargeable 450mAh lithium ion battery. The battery is removable, and the USB plug is exposed after removal. It can be directly inserted into the phone charging head, computer, and charging bank for charging.  5、Wide in Utility: Allows for convenient carrying, the LED reading lamp suits perfectly for leaning, reading, knitting and so on.