Coleman Conquer 200l LED Headlamp Reax adaptive lighting auto-adjusts the beam pattern and brightness for lighting short and long distances Rugged exterior provides increased impact resistance BatteryLock system stops battery drain to preserve battery life and reduce corrosion to protect your device Allows batteries to be stored in your device for years (up to their inherent shelf life) Comfort tension system uses soft, fabric tensioners that you can adjust while wearing your headlamp