Streamlight 2.0 Rail Mount Long Gun Light With Switch - Black - 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 (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 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; 6.30 in (16.0 cm); 9.06 oz (257 g) with one (1) SL-B50 battery pack; Limited lifetime warranty;