Fenix BT20 Bike Flashlight, Gray Max 750 lumen output from 4xCR123A or 2x18650 rechargeable batteries (recommended)--Batteries Not Included Five brightness levels-Turbo-750 Lumens (2hrs), High-450 Lumens (4hrs), Medium-300 Lumens (6hr 30min), Low-100 Lumens (21hr) and Strobe Simple operation including battery enclosure attachment and cabling IPX-6 Waterproof, 1 meters for 30 minutes Supported by limited lifetime guarantee from Fenix Lighting, US