The ProTac Rail Mount HL-X is a 1,000 lumen weapon-mounted light featuring a dedicated fixed mount for Picatinny rails. It uses either a remote switch with momentary/constant on operation or a standard push-button tail switch and runs on either two CR123A lithium batteries or one Streamlight rechargeable 18650 battery.TEN-TAP(R)Programming allows selection of three different operating programs: 1) high/strobe 2) high only 3) low/highLED illumination output:High for maximum illumination: 1,000 lumens; 332m beam; runs 1.25 hours (CR123A batteries); runs 1.5 hours (SL-B26 battery pack); 27,600 candelaLow for extended run time: 60 lumens; 80m beam; runs 20 hours (CR123A batteries); runs 23 hours (SL-B26 battery pack); 1,600 candelaStrobe for signaling or disorienting: runs 2.5 hours (CR123A batteries); runs 3.25 hours (SL-B26 battery pack)Dual-fuel - uses two CR123A lithium batteries (included); also accepts one Streamlight SL-B26(TM) protected Li-Ion USB rechargeable battery packEasy to use pressure switch comes with a button for on/off and a pressure switch for momentary activation.Integrated rail clamp attaches to MIL-STD-1913 railsEasy to attach, secure mountingDurable, anodized aluminum construction with impact-resistant tempered glass lensIPX7 rated with the Standard button switch installed; waterproof to 1 meter for 30 minutes.IPX4 rated with the Remote Pressure Switch installedOperating temperature: -40degF to +120degFAnti-roll headIncludes two CR123A lithium batteries, remote pressure switch, push-button tail switch, remote retaining clips, double-sided tape and, zip tiesSolid State power regulation provides maximum light output throughout battery lifeRoHS compliantLimited lifetime manufacturer's warranty**Please Note: Sale is final, no returns or exchanges, If defective follow manufacture's warranty instructions**