COMBO: Nitecore HC35 Rechargeable LED Headlamp - 2700 Lumen w/ battery & NB5000 Nitecore 5,000mAh Power BankFeatures & Specifications:LED:4 x CREE XP-G3 S3Power Source:1 x 21700, 1 x 18650, 2 x CR123As, 2 x RCR123As, or 2 x 16340sUtilizes a bead surface total reflective optic lens for uniform and soft lightLightweight and rigid CNC machined body for an excellent cooling performanceOne switch controls 5 brightness levels and 3 special modesStrobe mode uses randomly changing frequencies for stronger dizzying effectsThe power indicator beneath the switch indicates the remaining battery power and will also display the battery voltageWide range flood optic system of 100 illumination angle specially designed for outdoor applicationsBuilt-in Li-ion battery charging circuit with a micro-USB portIncorporated Advanced Temperature Regulation moduleSpecially designed lightweight and breathable headbandElectronic reverse polarity protectionConstructed from aerospace aluminum alloyHA III military grade hard-anodized finishMagnetic tailcap with stand capabilityOutput / Runtime / Throw:Turbo:2,700 lumens / 45 minutes* / 134 meters (when using a 21700/18650 with an output over 8Amp)High:800 lumens / 3 hours / 73 metersMedium:270 lumens / 8 hours 15 minutes / 40 metersLow:40 lumens / 52 hours / 14 metersUltra-Low:1 lumen / 1,200 hours / 3 metersStrobe:2,700 lumensBeacon:2,700 lumensSOS:2,700 lumensPeak Beam Intensity:4,500cdImpact Resistance:1 meterIP-Rating:IP68 (2 meters submersible)Dimensions:Length:5.05" (128.2mm)Head Dimensions:1.14" x 1.25" (28.85mm x 31.77mm)Tube Diameter:1.02" (26mm)Tail Diameter:1.11" (28.3mm)Weight:4.89oz (138.5g)Power Charger Capacity: 5,000mAh 3.7V (18.5Wh)Power Charger Rated Energy: 3,200mAh 5V (TYP 1A)Power Charger Input: USB-C: 5V-2.4A / ...