The NSR-9746B rechargeable aircraft-grade aluminum LED flashlight, offers 3 microprocessor-controlled brightness modes as well as a strobe function. Utilizing a CREE® LED, the 9746 has an impressive run-time of 4.25 hours in high-brightness mode. The 420 lumen output in combination with the high efficiency deep parabolic reflector design throws a usable beam of light 500 meters...that's over 1,640 feet. A waterproof design in combination with an impact and chemical resistant aircraft-grade 6061-T6 aluminum housing, make the 9746 one of the toughest full-size flashlights around. The large body switch provides momentary or constant-on plus a user-selectable set of 3 brightness settings and a disorienting strobe. Running on a rechargeable/replaceable Lithium-ion battery, the NSR-9746B light has a run-time rated at 4.25 hours in high mode, 10 hours in medium mode and 63 hours in low.