Fenix Bundle HP15 Expedition 500 Lumen Brightest Headlamp w/Diffuser & Lumentac Keychain Light - Use 4x AA: Extreme Bright Headlamp - Blinding 500 lumens & 188 yard throw Use commonly available 4x AA Batteries (Ni-MH or Alkaline) Come with an easy to use diffuser so you can change between flow & throw with push a button. 5 different brightness and SoS emergency signal, all easily accessible through large buttons Bonus diffuser and a bright 25 lumens LumenTac key chain light