Dual-Fuel: Power with three AAA Alkaline cells (included) or the rechargeable BD 1500 Li-ion battery and charger (purchased separately) for maximum flexibility 450 Lumen max output IP67: Waterproof-Tested to operate at least 1.0 meters underwater for 30 minutes PowerTap™ Technology allows instant transitioning between full and dimmed power Brightness Memory allows you to turn the light on and off at a chosen brightness without reverting back to default setting Settings include full strength in proximity and distance modes, dimming, strobe, red, green and blue night-vision, and lock mode Multifaceted optical efficiency lens technology Black Diamond Storm 450 Headlamp