Full-screen, the appearance can not see a screw, the product is suitable for all brands of electric paper books fill light auxiliary lighting and reading paper books. Specifications: Light switchable three color temperatures, brightness infinitely dimmable. Maximum brightness: 50 lumens. Three adjustable color temperature: 3000K - 5500K - 4500K. Power supply: 250MAH three-element polymer lithium battery. Maximum brightness can last: about 3 hours, theworking duration: about 3 to 15 hours (varies with brightness), the Charging time: about 40 minutes. Red indicator light is on when charging, and automatically turns off when fully charged. Instructions for use. 1: with the light on the brightness memory function, the default is the brightness of the last use. 2: long press the power switch for 3 seconds to turn on the light, the default light is 3000K color warm yellow light color. Then short press the power switch can cycle switch the light color: 5500K white - 4500K warm white - off the light. 3: In any light color light, long press the power switch dimming, from the current brightness to brightness 100%. release the power switch and then long press the power switch, the brightness of the light from 100% to 15%. Users can adjust the brightness according to their needs. Clip use:Plastic large clip is suitable for clamping all kinds of electric paper books, metal small clip is suitable for clamping paper books, double clip design for different scenarios. Soft rubber integrated integrated USB charging interface design, without the need for a separate charging cable.