The Firefly LED USB Light from GoalZero is an 80-lumen battery-free LED light. It is powered directly from any USB port for instant illumination. The light comes with three colored lenses that screw on for secure installation. With the lenses on, the light's output decreases to 60-lumen. A bendable and adjustable cord enables it to be used as a handle, a stand or to twist around a pole for hands-free use.