Fenix Flashlights HP15 500-Lumen Headlamp Max 500 lumen output from four AA batteries will throw light 172 meters 6 outputs including Turbo-500 lumens(1hr 30min), High-275 lumen(3hr 50min), Medium-125 lumen(14hr), Low-45 lumen(30hr), Eco-4 lumen(220 hr), and SOS Simple to use single button switch and removable battery case with extension cable for removing weight from your head and putting in your backpack IPX-6 Waterproof, 1 meters for 30 minutes Supported by limited lifetime guarantee from Fenix Lighting, US