Unilateral retractable USB PC LED lamp： 1. It’s don’t need to turn on bright light to interfere another person, just only use PC light when use PC at night. 2. It need neither AC power nor battery. 3. Using unilateral retractable USB cable, it’s quickly clean and collect, and easily to carry with you. 4. The looks of new item will be about to enter the market. Noted： 1). Welcome professional lamp manufacturer to inquiry about cooperation, that we can just only supply the unilateral retractable devices to you to produce lamp products. 2). Products detail, please look at our website= tianshingsu.diytrade.com