Directly plug the USB LED Light into the USB port on your laptop computer or PC - No external power supply is needed. Just easily turn on your laptop computer or PC to power the USB LED Light - Switch-less USB LED light. Remains on until you unplug the USB LED Light or turn off the laptop computer or PC - Gently adjust the flexible neck of USB LED light to position you wish - Power saving design comes with reliable LED light. LED light is rated to average 8000 hours of use - 3-LED light provides a bright and large working area adjustable gooseneck for easy light positioning - High-bright white LED can ensure clear view at night