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 inside or outside of the light using a USB-C cord - no need to remove from your weapon.Uses one (1) Streamlight SL-B50 protected Li-Ion USB-rechargeable battery pack (included)Features TEN-TAP programming - Choice of three user selectable programs:1) high/strobe 2) high only 3) low/highHigh: 2,000 lumens; 266 m beam; runs 2.5 hoursLow: 250 lumens; 93 m beam; runs 11 hoursStrobe for signaling or disorienting: runs 4.5 hoursIP67-rated; dust-tight and waterproof to 2 meters; 2-meter impact resistance tested6000 series machined aircraft aluminum with Type II MIL-Spec anodized finishMounts directly to guns with MIL-STD-1913 (Picatinny) railsAvailable as "light-only" or "system" (system includes remote pressure switch)6.30 in (16.0 cm)9.06 oz (257 g) with one (1) SL-B50 battery packAvailable in blackLimited Lifetime Warranty