The Fenix HM50R is a rechargeable headlamp built tough to withstand cold temperatures. The Fenix HM50R with full-metal housing is compatible with 16340 and CR123A batteries, handy and compact size, plus the headlamp can be used as a mini flashlight as well. Features a Cree XM-L2 U2 cool white LED with a lifespan of 50,000 hours with 4 output modes, reverse polarity protection to protect from improper battery insertion, easy one switch operation, can be used as a mini flashlight. Micro USB rechargeable (for 16340 batteries only). Includes spare O-ring, rubber anti-dust cover, silicone holder, ARB-L16-700 Li-ion battery and charging cable.