The ProTac Rail Mount HL-X Pro is a long range, low-profile, gun-mounted light that produces 50,000 candela and shines for 447 meters. Its Jack-Cap tail cap switch offers operational switch redundancy with both push-button operation or remote pressure switch operation.Multi-Fuel: Uses (1) SL-B26 protected Li-Ion USB rechargeable battery pack; also accepts (2) CR123A lithium batteriesTEN-TAP Programming Allows for Selection of Three Different Operating Programs: 1) High/Strobe 2) High Only 3) Low/HighHigh: 1,000 lumens; 50,000 candela; 447m beam distance; runs 1.25 hours (CR123A); runs 1.75 hours (SL-B26)Low: 60 lumens; 3,100 candela; 111m beam distance; runs 21 hours (CR123A); runs 24 hours (SL-B26)Strobe: runs 2.5 hours (CR123A); runs 3.5 hours (SL-B26)System includes remote pressure switch, Jack-Cap tail switch, remote retaining clips, double-sided tape, zip ties, and M-LOK mountIntegrated rail clamp attaches to MIL-STD-1913 (Picatinny) railsEasy to attach, secure mountingDurable, anodized aluminum construction with impact-resistant tempered glass lensIP67-rated; waterproof to 1 meter for 30 minutes (without remote pressure switch installed)IP54-rated; water-resistant (with remote pressure switch installed) Mounts directly to guns with MIL-STD-1913 (Picatinny) rails