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 their 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. FeaturesUses (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; 85,000 candela; 583m beam; runs 2.5 hoursLow: 250 lumens; 11,500 candela; 214m beam; runs 11 hoursStrobe for signaling or disorienting: runs 4.5 hoursIP67-rated; dust-tight and waterproof to 1 meter for 30 minutes2-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 "system" (syste...