Fenix HL21 Headlamp, Black Multi-purpose, indoor/outdoor LED headlamp with headband and push-button on/off switch Four digitally regulated output levels offer constant brightness and one flashing mode 93-meter beam; 90 to 3-lumen output; runtimes from two hours to 53 hours on one AA battery Plastic and aluminum alloy construction; toughened ultra-clear glass lens with anti-reflective coating Waterproof to IPX-8 standard; limited lifetime repair warranty