The Fenix HP40F headlamp puts visibility where it counts without disturbing fish. Variable LED output and two color options allow precise illumination for still fishing early and late. High power blue light with 24-meter beam distance and up to 8.5 hours runtime turns HP40F headlamp into a powerful tool from boat, dock and shore. Features middot;Utilizes Cree XP-E2 M3 LED and XP-G2 R5 LED with a lifespan of 50,000 hours middot;Uses two 18650 rechargeable cells or four CR123A batteries middot;Light size?3 inches/76mm (Length) x 2.19 inches/55.7mm (Width) x 1.24 inches/31.5mm (Height) middot;Battery box size?116.6mm (Length) times;56.3mm (Width) times;29.6mm (Height) middot;280.5-gram weight (excluding batteries) middot;Digitally regulated output maintains constant brightness middot;Two dedicated light sources with independent controls middot;Lockout function - prevents the light from accidental activation middot;Remote battery case shifts weight from head to belt or pack and middot;protects runtimes in cold conditions middot;USB output for emergency power to communication or navigation devices middot;60-degree tilt mechanism middot;Reverse polarity protection guards against improper battery installation middot;Made from durable aluminum alloy and performance plastic middot;Toughened ultra-clear glass lens with anti-reflective coating Beam Distance: Blue LED: 78.74 feet Maximum White LED: 360.9 feet Maximum Four EdisonBright CR123A Lithium batteries included in bundle. nbsp;