Petzl E87 P MYO RXP Headlamp Regulated power levels: constant lighting power, automatically switches to reserve power mode when batteries are almost discharged three lighting levels can be chosen (choose from among ten levels between 8 to 140 lumens Wide Angle lens allows to quickly switch from flood beam proximity lighting to focused long-distance lighting in a single movement Recommended to use alkaline/NiMH batteries - lithium batteries may overheat