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. Features: 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/high High: 2,000 lumens; 266 m beam; runs 2.5 hours Low: 250 lumens; 93 m beam; runs 11 hours Strobe for signaling or disorienting: runs 4.5 hours IP67-rated; dust-tight and waterproof to 2 meters; 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) 6.30 in (16.0 cm) 9.06 oz (257 g) with one (1) SL-B50 battery pack Available in black Limited Lifetime Warranty