Features: Portable Design: Small and lightweight, easy to carry around, perfect for travel or on camp. Bookmark Light: Ultra-thin design allows it to be used as a bookmark, you will never lose your page again. Built-in Battery: 250mAh rechargeable battery, which can continuously work for several hours. No cables are needed, it can be directly plugged into power bank or computer USB port to charge. Adjustable Color and Brightness: 3 color temperature adjustable, support stepless dimming, soft and even light, protect eyes. Memory Function: When reading light is turned on again after power off, it will automatically switch to the last used brightness. Specifications: Material: PVC + ABS Brightness: 50 Lumen Color Temperature: 3000K/5500K/4500K Battery: Built-in 250mAh Lithium Battery Charging Time: 40min Lasting Time: 2-3 hours(At Maximum Brightness) Item Size: 20.5 * 4 * 0.9cm/ 8.1 * 1.6 * 0.4in Item Weight: 45g/ 1.6oz Package Size: 20.7 * 5 * 2cm/ 8.1 * 2.0 * 0.8in Package Weight: 73g/ 5.6oz Packing List: 1 * Reading Light 1 * Magnetic Clip 1 * User's Manual(Chinese/English)