Comfortable and Adjustable Brightness: Designed with 18 LED bulbs (18 lumens), which produce natural, non-flickering light that won't hurt or strain your eyes. And there are 3 lighting modes, you can adjust the brightness just by touching the switch. USB rechargeable battery: Extraordinary battery life with built-in 1200mAh rechargeable battery and USB charging cable, you can use the high-intensity lamp for up to 3 hours after fully charged, and the indicator light changes from red to green when fully charged. Portable and flexible: this lamp of Playback features mini size and compact design, which makes it very easy to carry. The gooseneck arm (360 rotatable) allows you to position the light however you want. Usage: Perfect for reading, work, study, emergency use , suitable for study, office, bedroom, living room, dormitory, also perfect as a night light for baby's room.