The Nightstick TAC-550 is a rechargeable LED Tactical Metal Multi-function Flashlight that has 3 microprocessor-controlled brightness modes as well as a strobe function. With an LED rated at 200 lumens and its high-efficiency deep parabolic reflector, the TAC-550s beam has an effective range of 210 meters (over 688 feet). Its waterproof design in combination with its impact and chemical resistant aircraft-grade 6061-T6 aluminum housing, make the TAC-550 one of the toughest tactical lights around. The large tail-cap switch provides momentary or constant-on plus a user selectable set of 3 brightness settings and disorienting strobe. Running on a Lithium-ion rechargeable battery, the TAC-550 is rated at 3 hours of run-time.