1.[3 Adjustable Colors & Infinite Brightnesses] 3 useful color temperature modes: yellow (4000 K), warm white (4500 K) and white (6000 K), Each head has an independent switch for infinite levels of adjustable brightness. Long press the Shift key to gradually decrease the brightness from 100%. You can choose a comfortable setting as you like for reading, knitting, camping, or repairing, etc. 2. [Rechargeable & Durable] USB Type-C rechargeable which is reversible and therefore easier to plug in compared to other Micro-USBs. Up to 80 hours (general reading, single head) of powerful, non-decreasing brightness thanks to the included 1800mAh rechargeable battery, narrow beam angle (90). It's bright enough to cover the area you've put down and loud enough at the same time not to disturb your sleeping partner. 3.[Eye Protection & Ergonomic Design] ...