Fenix HP12 900 Lumen CREE LED Headlamp with 2 X EdisonBright CR123A lithium Batteries bundle 900 Lumens Cree XM-L2 LED with a lifespan of 50,000 hours Uses one 18650 or two 3V CR123A Lithium batteries Digitally regulated output - maintains constant brightness and Reverse polarity protection to protect from improper battery installation All-function switch in the head for easy and fast operation This bundle includes two EdisonBright CR123A lithium Batteries.