TWIST FOCUSING OPTIC: The simple Twist Focusing system goes from an Ultra View Flood Beam to Bulls-Eye Spot Beam. DUAL POWER RECHARGEABLE: Operates on rechargeable and alkaline batteries so you're never without power. Rechargeable batteries can be charged inside or outside of the headlamp with Flex Charge. SPECS: Light Output: 530 lumens (high), 65 lumens (low). Beam Distance: 156 meters (high), 54 meters (low). Runtime: 2.15 hours (high), 11 hours (low). INCLUDED ACCESSORIES: Li-Ion battery pack, 3 x standard AAA alkaline batteries, hardhat clips, USB charging cord, AC and DC adapters.