The cateye volt 500 xc front light is high powered 500 lumen light with a usb rechargeable battery and a proprietary opticube lens featuring 4 modes you can choose the best suited setting for the weather conditions you are riding in or to cope with the remaining battery life left to cycle through the modes keep on pressing the on and off button to charge the light simply plug into your laptop computer or a usb wall plug the battery can last up to 30 hours in its flashing mode and 1 hour i