The Black Diamond Ion Headlamp. Extremely compact and powerful, the fully redesigned Black Diamond Ion headlamp packs 100 lumens of power into a tiny package for just-in-case lighting and fast missions. With a push button housing that lets you easily switch from full power to dimmed, strobe or red night vision, the Ion has the functionality of a bigger light, with none of the extra weight. Features: One DoublePower LED emits up to 100 lumens on max setting Modern housing runs on two AAA lithium standard alkaline batteries Settings include full strength in proximity and distance modes, dimming, strobe, red night vision and lock mode IPX8: Waterproof--Tested to operate up to 1.1 meters underwater for 30 minutes. If submerged, water may enter the battery compartment and it will still operate, and it should be dried out completely afterwards.