The Fenix HP11 is an extremely high-intensity and water resistant outdoor headlamp. The dual switch system can transfer the 4 different brightness modes and 3 different flashing modes rapidly, to satisfy users in a variety of situations. It has a maximum output of 277 lumens on turbo mode, and can go as low as 4 lumens for minimal light and maximum runtime. The integrated design makes the battery case separated from the headlamp so the weight distribution is balanced. The Fenix HP11 headlamp is great for cycling, searching, hiking, caving, and many other outdoor activities where you need full use of your hands.The HP10 features four different levels of output, allowing you to dim the light as low as 7 lumens - which will run for up to 210 hours! ? Cree XP-G (R5) LED with a lifespan of 50,000 hours? Uses four 1.5V AA (Ni-MH, Alkaline) batteries? Light:59.5mm (Length)x50mm (Width)x55.5mm(Height) Battery Case:88.3mm (Length)x73.5mm (Width)x26.4mm(Height)? 180-gram weight (excluding batteries) ? Digitally regulated output - maintains constant brightness? Reverse polarity protection, to protect from improper battery installation? Dual switch system in the top, easy operation? The light is made of durable aircraft-grade aluminum, the rest is made of quality plastic? The metal part has a premium Type III hard-anodized anti-abrasive finish? Toughened ultra-clear glass lens with anti-reflective coating LED: Cree XP-G R5, Batteries: 4 x 1.5V AA (Ni-MH, Alkaline) Batteries Output/Runtime: (ANSI standard) Turbo: 277 lumens / 3h 51min High: 133 lumens / 9h 31min Mid: 55 lumens / 25h Low: 4 lumens / 206h Beam Distance: 154m Intensity: 5910cd Impact Resistant: 1m Waterproof: IPX-6 standard Dimensions- Light: 88.3mm (length) x 73.5mm (width) x 26.4mm (height) Weight: 180 g (excluding batteries) Impact Resistant: 1m