Bushnell H250L HD Rubicon 3AA Headlamp with Auto Dimming Quality optics with stunning HD clarity 100% quality materials used and tested extensively Beautiful design and durability built to last 250 Lumens plus 312 Lumens boost feature Advanced auto dimming feature automatically adjusts from long distance brightness to dim light for close viewing Dual output: spot for long range, flood for wide proximity Rear mounted external battery for extra-long runtime Red Halo low-lumen mode designed to enhance sight without compromising natural night vision