Customizable brightness settings ranging from high to ultra-low. Textured tube for perfect beam pattern. Lumens: 390 (high), 100 (low). Runtime: 85 hours (high), 299 hours (low). Beam distance: 10 m on (high), 6 m (low). IPX4 water-resistant design. Lifetime LEDs never need replacing. Powered by 8 D batteries (sold separately). 3-year limited warranty.