GLL&reg; Led Desk Lamp Dimmable with 5V 1A USB Charging Port, 3W 3-Level Brightness Table Lamp with Touch Sensitive Control, Eye-care Reading Lamp Study Lamp with Folding Neck,Led Office Table Light 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.