The ProTac 2.0 Rail Mount HP offers the perfect blend of power at 2,000 lumens and 85,000 candela. It features a tail cap switch for momentary or constant on operation and a port for an optional remote pressure switch. Powered by our SL-B50 battery pack that charges charges using a USB-C cord outside of the light or inside - no need to remove from your weapon. Uses (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; 85,000 candela; 583m beam; runs 2.5 hours Low: 250 lumens; 11,500 candela; 214m 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 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 System includes remote pressure switch, remote retaining clips, double-sided tape, zip ties, and M-LOK mount Length: 6.30 in (16.0 cm) Weight: 9.06 oz (257g) with (1) SL-B50 battery pack Limited lifetime warranty