Besides an optimized size, Fenix HP15 ultimate edition features a dedicated switch that makes 900-lumen burst mode directly accessible even if the light is off. With six outputs including SOS, rugged aluminum chassis and IPX-6 waterproof rating, this headlamp is a reliable tool for mountaineering, searching, caving and more. Features Utilizes Cree XM-L2 U2 LED with a lifespan of 50,000 hours Uses four AA batteries, either Ni-MH or Alkaline Digitally regulated output maintains constant brightness Lockout function prevents the light from accidental activation 60-degree tilt mechanism Reverse polarity protection guards against improper battery installation Made from durable aluminum alloy and performance plastic Premium Type III hard-anodized anti-abrasive finish Toughened ultra-clear glass lens with anti-reflective coating Specifications Light Size 2.7 x 2.2 x 1.4 Battery Case Size 3.5 x 2.9 x 1 Weight 5.4 oz Excluding Batteries Color Gray Mod Fenix Flashlights Fenix HP Series 900 Lumens Fenix HP Series; Gray