The Fenix HM50R Rechargeable headlamp is another great & innovative addition to the HM Series!It's capable of producing a brilliant 500 lumens visible over 80 meters (87 yards) away, & can last up to 148 hours! Powered by a single 16340 battery (included), the HM50R has an integrated micro-USB port, protected by a screw-top cap, to charge your battery directly in the light.Whether you're using the HM50R for hands free lighting, or taking it out of the headband for hand held carry, this light can be used for camping, hiking, household chores & so much more!Specifications LED: CREE XM-L2 U2 Battery Type Supported: 1x 16340 or 1x CR123A Peak Beam Distance: 80 meters (262.48 ft.) Peak Beam Intensity: 1813cd Brightness Outputs (1x 16340): --- Turbo: 500 Lumens / 2.5hrs--- High: 130 Lumens / 10hrs--- Medium: 30 Lumens / 24hrs--- Low: 4 Lumens / 90hrs Water Resistance: IP68 (Dustproof, waterproof & submersible up to 2m) Impact Resistance: 1m(3.28ft) Dimensions: Length-2.66" (67.5 mm)) X Head Diameter-1.30" (33 mm) X Body Diameter-1.10" (28 mm) Weight: 2.2 oz. (63g)Features Uses Cree XM-L2 U2 white LED with lifespan of 50,000 hours Powered by one rechargeable 16340 Li-ion battery or one CR123A Lithium battery Micro USB rechargeable (16340s only) Premium type III hard-anodized anti-abrasive finish Material is quality aluminum Easy operation with only 1 switch Can be used as a mini flashlight Reverse polarity protection to guard against improper battery insertion Sweat-channeling, reflective headband Capable of withstanding temperatures down to -40º (CR123’s ONLY) Toughened ultra-clear glass lens with anti-reflective coating IP68 rating – underwater up to 6.6 feet/2 meters and dust proof Certified by RoHS, CE, FCC and CEC