The M640DFT-PRO Turbo Scout Light Pro combines the best attributes of the standard M640 Scout Light Pro with high-candela performance and dual-fuel capability, and its Turbo Series reflector delivers the farthest-reaching beam and longest runtime of any SureFire long-gun WeaponLight. Ideal for long-range target identification, the M640DFT-PRO projects a blinding, peak beam intensity of 100,000 candela when powered by the included SF18650B rechargeable lithium-ion battery, or 90,000 candela when powered by two 123 lithium batteries. Its precision reflector creates a tightly focused, concentrated shaft of light with minimal bounce when peering over, under or around barricades. Our Low-Profile Mount (LPM) delivers unprecedented versatility, allowing the user to optimize the light&';s position relative to the rail and other attached firearm accessories. Rugged and reliable, the LPM easily and securely attaches to any MIL-STD-1913 or M-LOK rail. Constructed of lightweight aerospace aluminum, Mil-Spec hard anodized, and O-ring sealed to keep out the elements, the M640DFT-PRO is the best-performing, most durable, and most feature-rich WeaponLight for its size. Features: Generates 100,000 candela and 700 lumens of tightly focused light with included SF18650B battery Versatile Low-Profile Mount (LPM) allows the user to optimize the light&';s position relative to the rail and other attached firearm accessories Mounts for MIL-STD-1913 rails and M-LOK rails included Mil-Spec hard-anodized aluminum body and tempered window make it light rugged, durable and combat ready Easy, instant activation via ZE68 momentary/constant-on pushbutton switching with protective shroud Compatible with a host of SureFire accessory remote switches Meets IPX7 waterproof test standard at 1 meter for 30 minutes *Note: SF18650B battery required for 700-lumen output, 100,000 candela, 2.75-hour runtime, and 632-meter beam distance