1.3 Color & 6 Brightness Adjustable 3 useful color temperature modes: yellow(3000K), warm white(4000K) and cool white(6000K). Each head owns an independent switch for 3 brightness levels dimmable. You can choose a comfortable setting as you wish for reading, knitting, camping, or repairing etc. 2.Rechargeable & Long-LastingUSB rechargeable which is reversible and thus easier to plug in compared with other Micro-USB. Up to 80 hours (general reading, single head) of powerful, non-diminishing brightness from the included premium rechargeable 1000mAh battery. 3.Eye Caring & Ergonomic Design No flickering and blue light filter design with advanced LED beads. No eye strain any more for both kids and adults. The arms are supple and adjustable so you can get the angle most comfortable to you. Ergonomic neck around design, and it is totally hands free! 4.Exterior design Special narrow beam angel(90) design. It is bright enough to the area you positioned and at the same time dim enough to not disturb your sound asleep partner. 5.LIGHTWEIGHT and COMPACTThe flexible neck light does not take up much space and fits easily into your suitcase. This makes it an ideal choice for a portable reading light.