The Fenix HM50R is a rechargeable headlamp, built tough to withstand cold temperatures. The Fenix HM50R has a IP68 rating, cold-resistance, 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, all of which make the Fenix HM50R perfect for high altitude climbing and long distance hiking in rigid environments.
 
Specifications
Utilizes Cree XM-L2 U2 cool white LED with a lifespan of 50,000 hours
Micro USB rechargeable (for 16340 batteries only)
4 output modes
Turbo - 700 lumens 
16340 - 2.5 hours
CR123 - 2 hours
High - 130 lumens
16340 - 10 hours
CR123 - 14 hours
Med - 30 lumens
16340 - 24 hours
CR123 - 48 hours
Low - 4 lumens
16340 - 90 hours
CR123 - 128 hours
Reverse polarity protection to protect from improper battery insertion
Easy one switch operation
Can be used as a mini flashlight
Perfect for rigid environments
Sweat-channeling, reflective headband
Made of quality aluminum
Premium type III hard-anodized anti-abrasive finish
Toughened ultra-clear glass lens with anti-reflective coating
WITH CR123 - withstands temperatures down to -40º
Capable of high altitude climbing, hiking, or running in rigid environments
IP68 rating - underwater up to 6.56 feet/2 meters
 
Size
Length: 2.66 in./67.5mm
Width: 1.3 in./33mm
Height: 1.1 in./28mm (including the lamp holder)
Weight: 2.22 oz./63 grams (excluding battery)