AIRFIT headband (Petzl patent) - semi-rigid headband and ultra-thin lamp body. The battery pack is in the rear, to distribute the weight of the headlamp over the entire head, making it balanced and comfortable enough to be almost imperceptibleWater-repellent - resists sweat and rain and improves air circulationOptimal visual comfortMultiple LEDs provide even light distributionRechargeableCORE battery charges via micro USB portHYBRID CONCEPT design: IKO CORE comes with the CORE rechargeable battery and also works with three standard batteries. The lamp detects the energy source and adjusts lighting performance (IKO CORE with CORE rechargeable battery= 500 lumens, IKO CORE with standard batteries = 350 lumens)Reflective components on rear - increase visibilityBattery charge indicator - preserves battery when lamp is turned on or offTwo LOCK functions to avoid accidentally turning it onCan be flattened in its minimal pouch to reduce bulkCompatible with all Petzl helmetsLight output: 500 lumens (ANSI-FL1 STANDARD)Weight: 79 gBeam pattern: flood or mixedEnergy: 1250 mAh CORE rechargeable battery (included)Charging time: 3 hBattery compatibility: alkaline, lithium or Ni-MH rechargeableWatertightness: IPX4 (weather-resistant)Certification(s): CEBeam optionsTwo beam types (flood or mixed)Many white brightness levels - including proximity lighting, movement and distance visionThree lighting levels: low, medium, high