Black Diamond Wiz Headlamp 2 Single Power LEDs gives 16 lumens (on max setting), powered by 2 AAA batteries providing up to 120 hours of light CPSIA certified with child-safe screw closure and breakaway safety strap IPX 4 water resistance rating On/Off/Strobe modes plus unique infinite dimmer feature Also has an auto power-off function to prevent totally battery loss if accidentally left on