1. [3 Colors; Infinitely Adjustable Brightness] 3 usable color temperature modes: yellow (4000K), warm white (4500K) and white (6000K), each head has an independent switch for unlimited levels of adjustable brightness. Long press the shift button to gradually reduce the brightness from 100%. You can choose a comfortable setting according to your needs for reading, knitting, camping or repairing, etc. 2. [Rechargeable and Durable] USB Type-C is rechargeable and can be used on both sides, so it is easier to connect to other Micro-USB. The included 1800mAh rechargeable battery provides up to 80 hours (general reading, single head) of powerful, non-dimmable brightness with a narrow beam angle (90°). It is bright enough to cover the area you place it on while being quiet enough not to disturb your sleeping partner. 3. [Eye protection and ergonomic design] Flicker-free and filtered blue, with advanced LED beads. Children and adults no longer experience eye strain. The arms are flexible and adjustable so that you can get the most comfortable angle. Ergonomic neck design, hands completely free. 4. [Adjustable and foldable]: The lamp head can be rotated 270°, you can easily adjust the comfortable angle and brightness to suit your needs. It can also be folded into a desk lamp position and placed on your desk in a balanced and stable way, making it more comfortable for you to type.