The Nitecore HC35 headlamp has an impressive maximum output of 2700 lumens from the 4 x Cree XP-G3 S3 LED. The light has a range of battery options; choose from using the included 21700 li-ion or alternative 21700 with an output of 8A, an 18650 li-ion with an output of 8A, 2 x CR123 single use or RCR123 (16340) li-ion cells. The HC35 offers a range of sought after features, including a micro USB port on the head of the light for recharging either a 21700 or 18650 battery inside the headlamp itself, removing the need for a separate, external charger. The headtorch has the same L-shape that has made the HC30 and HC33 lights so popular. The HC35 has a detachable bracket so the light can be interchangeably used as either a headlamp or hand held torch. Additionally, the light comes with a pocket clip and a magnetic tail cap for other attachment options. The Nitecore HC35 has a simple user-friendly interface made up of one button on the head of the light which controls all five brightness levels and three special modes. Brightness Levels Using 1 x 21700 battery Turbo: 2700 lumens - 45 mins runtime High: 800 lumens - 3 hrs runtime Mid: 270 lumens - 8 hrs 15 mins runtime Low: 40 lumens - 52 hrs runtime Ultralow: 1 lumen - 1200 hrs runtime Plus Strobe, Beacon and SOS (2700 lumens). Maximum beam distance 134 meters, waterproof to IP68 and resistant to impacts up to 1 meter. Includes: Nitecore NL2140HP 4000mAh 21700 battery, USB charging cable, 18650/CR123 battery magazine, headband, bracket, spare o-ring, pocket clip, lanyard.