Fenix HL50 LED Headlamp 365 Lumen one CR123A or AA Battery, with one LegionArms CR123 Lithium Battery Max 365 Lumens, Utilizes Cree XM-L2 T6 neutral white LED with a lifespan of 50,000 hours Uses one 3V CR123A Lithium battery or AA (Ni-MH, Alkaline) battery You can pop the lighting head out for handheld or keychain use All-function switch in the head for easy and fast operation Bundle includes one LegionArms CR123A lithium Battery