[Rechargeable & Long-Lasting] USB rechargeable which is reversible and thus easier to plug in compared with other . Up to 80 hours (general reading, single head) of powerful, non-diminishing brightness from the included premium rechargeable1000mAh battery. [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 neckaround design, and it is totally hands free [Partner Friendly] Special narrow beam angle(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.