Product Description material: plastic Size: 11.5*5.8*2.1CM Voltage: 3.7V Lumens: 16 lumens Battery: 3.7 V 200 mAh Power: 0.2 W Charging time: 1.5 hours Working time: up to 8 hours Mode: Two gears adjustable Color temperature: first gear, 4000K; second gear, 1550K Color: white Quantity: 1 piece Package content: 1* book light, 1* manual (with battery) 1.USB rechargeable Easy charging with built-in USB, directly connect to laptop, power bank, car charger or USB socket for charging, no additional cables required. 1.5 hours charging time approx. Working time up to 8 hours (at brightness setting). 2.Compact & LightweightMini size design, 11.5*5.8*2.1cm, small and lightweight, ideal to clip on the book when reading at night, it can be folded completely flat and slim, portable for reading on plane, train or in the back seat of a car when travelling. 3.Flexible Lighting AngleCompletely flexible design, the LED lens can be rotated 90left and right horizontally and 45down; the 350 flexible holder can be bent at any angle for optimal viewing without having to constantly reposition the light. 4.Adjustable lighting modesSoft white light, brightness to choose from, soft warm light creates a private reading space for your bedtime readingallows you to choose the perfect brightness when reading; enjoy your time reading in bed without disturbing your roommate. 5.Gift for children: Compact size and multi-functions, this book light is a good gift for avid readers children who love to read everywhere. It can also be used as a bookmark or mini torch when power failure.