The high-performance ProTac 2.0 Rail Mount produces 2,000 lumens without sacrificing run time. Powered by the new SL-B50 battery pack that charges using a USB-C cord outside of the light or inside - no need to remove from your weapon. Uses one Streamlight SL-B50 protected Li-Ion USB-rechargeable battery pack (included). Multi-function, push-button tactical tail switch or dual remote pressure switch with latching push button. One handed operation of momentary, variable intensity or strobe mode. Features TEN-TAP programming - Choice of three user selectable programs: High for maximum illumination: 2,000 lumens, 17,700 candela, 266m beam and runs 2.5 hours; Low for extended run time: 250 lumens, 2,150 candela, 93m beam and runs 11 hours; Strobe for signaling or disorienting: runs 4.5 hours. IP67-rated; dust-tight and waterproof to 1 meter for 30 minutes (IPX4-rated when remote switch is plugged in). 2-meter impact resistance tested. 6000 series machined aircraft aluminum with Type II MIL-Spec anodized finish. Mounts directly to guns with MIL-STD-1913 (Picatinny) rails. Available as light-only or system (system includes remote pressure switch). 9.06-Ounce (257 g) with one SL-B50 battery pack.