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 using a USB-C cord outside of the light or inside no need to remove from your weapon. Product Features 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 Product Specifications High Lumens 2,000 Run Time on High 2.50 hours Run Time on Low 11.00 hours Beam Distance 583 meters Max Candela 85,000 Battery Type SL-B50 Rechargeable Battery Pack Battery Quantity 1 Length 6.30 inches (16.00 centimeters) Weight 9.06 ounces (256.85 grams)