Fenix HL50 365 Lumen light weight LED Headlamp with AA extension tube, EdisonBright CR123A Lithium battery and EdisonBright AA alkaline battery Maximum output of 365 lumen using CREE XM-L2 (T6) LED Uses one 3V CR123ALithium battery or AA (Ni-MH, Alkaline) battery 57-gram1.83oz weight (excluding battery) All-function switch in the head for easy and fast operation AA battery Extention tube, EdisonBright AA Alkaline & CR123A Lithium batteries included.