The Petzl Iko is a handy headlamp that offers a maximum power output of 100 lumens in standard mode for 8 hours, with two optional modes to save battery power or to use it at its maximum lighting potential at 350 lumens. This model runs on a rechargeable battery not included and can be used with three AAA/LE03 batteries included. The semi-rigid AiFit headband is hydrophobic, promotes airflow and allows for use in a variety of ways: on the head, around a helmet or neck, placed on a table or attached to a stake. The dual lock function prevents accidental start-up to conserve battery power until you need the light. Weatherproof, the Iko is a well thought out model that also offers two beam patterns depending on your needs: mixed or wide. Features: Power: 350 lumensLight color: whiteHybrid Concept construction: battery operatedAirFit headband: semi-rigid hydrophobic headband promotes air circulationDouble Lock function: prevents accidental switching onBeam type: wide or mixedWaterproofing: IPX4 (weatherproof)Power: 3 AAA/LE03 batteries (included) or CORE rechargeable battery (sold separately)Battery compatibility: Alkaline, lithium or rechargeable Ni-MHCompatible with all Petzl helmetsWeight: 90 g Detailed lighting performance: White economy mode: 6 lumens over 10 meters for 100 hoursWhite standard mode: 100 lumens over 45 meters for 8 hours (reserve: 20h)White maximum mode: 350 lumens over 80 meters for 2 hours (reserve: 50h) Headlamp Petzl ---Iko Black