H40 is a simple, compact, lightweight running headlamp with tremendous power and reliability. Equipped with one CREE XP-L HD LED, this high-performance headlamp provides you with a fuller, more evenly-lit view at night. It features infinite dimming outputs ranging from 230lumens to 15lumens by Li-ion battery, ranging from 230lumens to 20lumens by Ni-MH or Alkaline AA battery, and an SOS mode for emergency situations. There is another version for optional, which is equipped with one Luminus SST-20 CRI 95+ LED, this allows a warm and soft beam to resemble the nature of sunlight, reducing eye strain and makes it ideal for photography. The headlamp's body is constructed from aerospace-grade and hard-anodized aluminum, letting it withstand drops from as high as 2 meters and allowing it to be waterproof to IP68. Super lightweight, remarkably rugged, and incredibly user-friendly, H40 headlamp is one perfect light for any outdoor activities!