Dorcy Pro Series Rechargeable 4000 Lumen Flashlight and Power Bank. This rechargeable flashlight has four available settings, including high, medium, medium-low and low, with 4,000 lumens, 1,550 lumens, 700 lumens and 55 lumens on each respective setting. The long-lasting 5000mAh lithium-ion battery allows the light to shine for up to 100 hours on its lowest setting and two hours on its highest, providing you with consistent illumination.