Product Description: Quantity: one set Color: Black The light can switch between three color temperatures and the brightness can be continuously adjusted. Maximum brightness: 50 lumens; Three adjustable color temperatures: 3000K - 5500K - 4500K; Power supply: new 250MAH ternary polymer lithium battery; Duration: about 4 hours, charging time: about 40 minutes; The red LED indicator lights up when charging and automatically turns off when fully charged. How to use: With brightness memory function when the light is on, the default is the brightness used last time; Press the power switch to turn on the light, the default color is warm yellow 3000K, then quickly press on the power switch to change the light color cycle: white light 5500K - warm white 4500K - turn off the light; When a light color is on, long press the power switch to adjust the brightness of the current brightness to 100%, release the power switch, then long press the power switch, the light brightness will be adjusted from 100% to 15%;< /p> Users can adjust the brightness according to their needs. Choose the right reading lamp brightness according to ambient brightness. 4 level adjustable brightness, 25%-50%-75%-100%. Very useful for reading on books or other devices such as kindle, ipad, tablet. Or just move this foldable reading lamp to a flat surface to serve as a small lamp. Clip lamp of a cute size, easy to carry in the pocket or the small bag. Suitable for indoor or outdoor use. The clip is magnetic so the USB clip light can attach very securely to any piece of furniture like bedside, desk, table, shelf, desk, even the ceiling.< /p> USB rechargeable. No extra cable needed. 3-4h lighting time after 30min-1h full recharge. Our small reading lamp emits 8LM soft cold white light at 5000K-6500K temperature, soft and healthy for people. eyes, ideal for reading or working through the screen of electronic devices. The elegant design the f