This laptop plug light comes with five super bright white LEDs, up to 100,000 hours. No batteries required, the LED light plugs directly into the USB port on any computer or other device. This laptop has a dual light output of light that shines very bright white light from the front and the soft blue light lit up on the back for reduced eyes. One-touch functions ON / OFF / DIMMER operation. Press once for full brightness, again for softer light and a third time to turn off the light. This USB light has an 8 “flexible neck for positioning in almost every corner perfect for school, home, office, travel and much more Assembly level / degree of difficulty.! No assembly required.