LEPOWER Clip on Light/Reading Light for Reading,Working,AC Adapter and USB Cable Included (White) 2 levels brightness adjustable ,and 2 colors of light (warm yellow/ white) can be change. Free Angle Adjustable of arm and lamp holder, place your book light for best viewing. Strong Clip : Clip it on any board thickness within 5cm, it won't be wobbling when you need direct the light. USB cable and AC adapter :you can plug in PC,power bank or wall socket. Warranty: 12 months warranty,3 months moeny back.Nothing to worry about.