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. Yellow Body. Weight: (with batteries) 6.3 ounces Dimensions: 1.69" (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. Uses 4 "AA" alkaline batteries, INCLUDED.