Light source...LED Button battery operated Camp tent guy ropes become difficult to see when it gets dark, and children can trip over them and fall. It's dangerous for adults to trip over them too. This product is designed to prevent such accidents by making them visible with LEDs! The lights have been tested and are working. When you insert a button battery and press the button, it cycles through: slow flashing → fast flashing → solid on → off. The button battery is included so you can see the model number (it is depleted, so please replace it). Please note that this item has been used a few times.