The flexible neck USB powered clip light is very convenient and useful for computer. It is powered by USB port no need any external power. The flexible neck can adjust the light to any position you wish. The 3-LED provides a bright and large working area adjustable gooseneck for easy light positioning. The light is lightweight and portable perfect for travel companions. - 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 USB LED Light. - Switch-less USB LED light. Remains on until you unplug the USB LED Light or turn off the NOTEBOOK or PC. - Gently adjust the flexible neck of USB LED light to position the flylight anyway you wish. - power wastage less than 40 mA. - Power saving design comes with reliale LED light. LED light is rated to average 8000 hours of use. - Durable featherweight construction and small enought for taking away easily. It fits into your case as easy as it fits your style. - 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