Nitecore - hc90 rechargeable head lamp. Model nchc90. Measures 3 3/4" overall. Black rugged haiii military grade hard anodized aluminum housing that can be rotated wide range preventing illumination dead zones. Cree xm-l2 led. 900 lumens. Equipped with unique secondary RGB LEDs (red, green and blue). Red light preserves night vision, blue light aids in tracking game and green light maintains a low profile. Each setting can be accessed without having to cycle through the white led. Toughened ultra-clear mineral glass with anti-reflective coating. True variable output with a unique "infinitely variable" sliding control switch permits rapid and accurate mode switching/brightness adjustment with the use of one hand. Beam distance - up to 110m. Candlepower - up to 3000cd. Three settings: Turbo - lumens: Up to 900 lumens, runtime on one 18650 battery - 45m, runtime on two cr123 batteries - 1h. High: Lumens - up to 530 lumens, runtime on one 18650 battery - 2h, runtime on two cr123 batteries - 1h 30m. Low: Lumens - up to 0.2 lumens, runtime on one 18650 battery - 200h, runtime on two cr123 batteries - 120h. Integrated temperature sensor and intelligent temperature control ensure stable and safe operation. High-efficiency regulation circuit provides unwavering output as battery life diminishes. Impact resistant - up to 1.5m. Water resistant and submersible - up to ipx-8 (2m). Uses one lithium-ion 18650 battery (not included) or two cr123 batteries (not included). Includes black and gray adjustable elastic nylon head strap with logo, removable black composition head strap and light holder, micro-USB cord for recharging the 18650 battery, two O-rings and spare port plug. Designed for hiking, climbing, camping and general outdoor recreation. Hang packaged.