Product information: Lampshade material: Alec Switching mode: push-button type Color: Set with magnetic clip Style: Modern and simple Power supply: USB power supply Style: Portable Specifications: The light can change the color temperature of three sections, and the brightness is stepless dimming. Maximum brightness: 50 lumens; Three stage adjustable color temperature: 4500K-3000K-5500K; Power supply: 250MAH ternary polymer lithium battery; Maximum sustainable time of brightness: about 3 ~ 15 hours (varies with the brightness), charging time: about 40 minutes; The red indicator lights up when charging, and it will be automatically extinguished when fully charged. Instructions for use: With on light degree memory function, the default is the brightness used last time, after 30 seconds on, press the switch can be quickly shut down; Press the power switch to turn on the light. The default color is 4500K neutral natural light. Then press the power switch quickly to switch the light color: 3000K warm light -- 5500K white light -- lights off; In any light color, long press the power switch dimming, from the current brightness to 100% brightness, release the power switch and then long press the power switch, lamp brightness from 100% to 8%; Users can adjust the brightness according to their own needs. Packing list: Bookcase lamp*1