For a technical user who expects all-around performance and features out of their headlamp but still values a small size and compact package. Features: Dual-Fuel: Power with three AAA Alkaline cells (included) or the rechargeable BD 1500 Li-ion battery and charger (purchased separately) for maximum flexibility 400 Lumen max output PowerTap™ Technology allows instant adjustment between max output and dimmed power Integrated battery meter display shows % of power remaining Settings include proximity and distance modes, dimming, strobe, red LED night-vision and lock mode Brightness Memory allows you to turn the light on and off at a chosen brightness without reverting back to default setting Red night vision has dimming and strobe modes and activates without cycling through the white mode Multifaceted optical efficiency lens technology Digital lock mode feature safeguards against accidental use when stored in a pack or pocket IPX8: Waterproof-tested to operate at least 1.1 meters underwater for 30 minutes. If submerged, water may enter the battery compartment and it will still operate; it should be completely dried out after use in wet conditions Weight: 77.5 g with batteries Black Diamond Spot 400 Headlamp