Orascoptic?s brightest headlight, the Discovery employs constant current technology to ensure light output does not diminish over the run-time of the battery. A sleek battery pack design with the absence of knobs and a headlamp with built-in heat dissipation deliver a comfort that will last from your first procedure of the day to your last. The Discovery comes with a four year warranty on both the LED and cable, and a one year warranty on the battery pack.