DZT Portable Flexible Mini USB 1 LED Light USB Lamps for PC Notebook Laptop Silver Directly plug the USB LED light into the USB port on your notebook or PC No external power supply is needed. Just easily turn on your notebook or PC to power the light Remains on until you unplug the light or turn off the notebook or PC Gently adjust the flexible neck of the light to position the fly light anyway you wish Power saving design comes with reliable LED light, the light is rated to average 8,000 hours of use