The Fenix HM50R is a compact, lightweight, rechargeable headlamp with up to 500 lumens of brightness. Four output modes including turbo, high, med, and low, give you between 2-128 hours of life. The HM50R is powered by one rechargeable 16340 lithium-ion battery or one CR123A lithium battery. One button operation keeps your hands free making this convenient for outdoors recreation or hands-free work. Constructed of aluminum with a hard-anodized anti-abrasive finish. The headband is reflective and channels sweat away from your face. Toughened ultra-clear glass lens with anti-reflective coating.Features:Cool white LED with a lifespan up to 50,000 hours;Micro USB rechargeable (16340 batteries only);4 output modes;1 switch operation;IP68 waterproof rating