YAMAY(TM) Protable Adjustable Modern USB LED Desk Table Lamp Light Bulb with Dimmer Touch Power by USB or Battry Ultra Flexible Arm for Student Reading Office For Laptop Notebook Blue Power By USB or 3 x AAA batteries.(no include) Color: blue, green and white for your choice Low Power Comsumption Soft White LED Light with Touch Dimmer Adjusable: the tube can be bended to any anger as you like. The Brightness of the lamp can be adjusted, when choose the best birghtness you like just loosen finger