The Streamlight® ProTac® Rail Mount 2 has two brightness modes, a high and a low, with output rates of 625 lumens on High, and 60 lumens on low. The run times are: 2h on High, and 21h on Low. The Candela rates are: 22,000cd (High), and 2,000cd (Low). The beam/throw distances are: 297m (High), and 89m (Low). This flashlight is meant to be paired with Picatinny/MIL-STD-1913 gun rails. Takes two CR123A batteries, which are included. Built from hard-anodized aluminum. IPX 7 rating using the included push-button tailcap switch, and 4 using the included dual remote pressure switch. -40 degrees F -- +120 degrees F is this product's operating temperature. Has TIR/total internal reflection lens, TEN-TAP® programming, and a Streamlight C4® LED. Lens is BOROFLOAT® glass. Streamlight limited lifetime warranty available with this item. Includes accessories like a dual remote pressure switch, push-button tailcap switch, double-sided tape, zip ties, two CR123A batteries, and remote retaining clips.