GLL&reg; Led Desk Lamp Reading Lamp Light Touch-Sensitive Control 3 Levels Dimmable Folding Neck Book Light,Portable Eye-protected lamp for for Study, Reading, Working,Camping Dimmable touch switch, short touch turn on/off, long touch the light from brightest to dimmed, long touch again, the light from dimmed to brighter and brighter The led lamp is with new technology, no glaring,no flickering,no IFR/UV, no radiation,use green raw materials,Led health light, Power saving and long life time, Led chip only asks for 5V working power,it needs only very little power to turn on Built in battery, the lamp can continue to work over 3-5 hours after fully charged Usb charging power cord, the lamp can be charged by any usb port power,like pc, computer, power bank, usb charger.