USB rechargeable, energy saving- With LED lighting of eye production, it does not cause any harm to the eye, protect your eyes comprehensively, you can relax in reading and studyingWell-constructed, sturdy and made of premium quality materials.- Infinitely flexible and adjustable neck for easy positioning of your book reading light.- Gives stable and evenly distributed light, without hot spots or flicker.- Lightweight and compact, ideal for travel, camping or any activitiesCustomize:Model: YW2021A-YW2021B-YW2021C (randomly choose)Material: ABSColor: random colorBattery capacity: 400mAhInput voltage: 5VPower input: 3 wattsInput current: 1AInput frequency 50hzfunction 3file lightPower output: 1.6 wattsOutput current: 0.5AInput frequency: 50HzNB:1. Due to the light and screen settings difference, the items' color may be slightly different from the pictures.2. Please allow slight dimension difference due to different manual measurement.