The EINSTEIN 1000 FLEX is a low-profile, high-output headlamp delivering up to 1,000 lumens in Turbo mode bursts. It features five lighting modes: Turbo (1,000 lumens), High (350 lumens), Medium (150 lumens), Low (10 lumens), and a 5-lumen Red light mode for night vision preservation. Black anodized aluminum and ABS construction, IPX4 water-resistant. This Flex-Fuel model includes a rechargeable 18650 Lithium-Ion battery but can also run on two CR123A batteries for emergency use (in reduced performance compared to the 18650). The USB-C charging system includes an integrated red/green LED battery status indicator. Designed for durability, it offers a 120-meter beam range and up to 18 hours of runtime on the lowest setting.