Streamlight's Propolymer 4AA L.E.D. features 7 super-bright, White 100,000-hour LEDs - so you'll never need to replace a bulb again. It's also remarkably comfortable to use because it's ergonomically shaped for your hand. It is constructed of impact resistant polymer with a rubber face cap, a momentary "blink" or constant "on" tailcap switch & a unbreakable polycarbonate lens. Up to 84,000 millicandela. Up to 155 hours continuous run time. LED lamps: 7 100,000-hour lifetime, high-intensity WHITE Light Emitting Diodes (LEDs). Material: Shock resistant, engineering grade polymer case; Unbreakable polycarbonate lens. Weight: (with batteries) 6.3 ounces, imensions: .69" (D) x 6.5" (L) , Run Time: Up to 155 hours. Special Features: Class I, Division 1-Approved for use in hazardous locations; Waterproof; Non-conductive and corrosion-proof. Available in Yellow (68202)(shown) or Black (68302) Specify Color Below. Helmet clamps are available for convenient, hands-free operation.