The ProTac series expands into weapon-mounted lights with this 350 lumen light featuring a fixed mount for MIL-STD-1913 (Picatinny) rails. It uses either a remote pressure switch with momentary/constant-on operation or a standard push-button tail cap switch, and can run on either an alkaline or lithium battery.Multi-Fuel: Uses one (1) AA alkaline or one (1) CR123A lithium battery (both included); also accepts AA lithiumCR123A Lithium:High: 350 lumens; 219m beam; runs 1.75 hours; 12,000 candelaLow: 40 lumens; 19m beam; runs 14.5 hours; 1,380 candelaAA Alkaline / AA Lithium:High: 150 lumens; 141m beam; runs 1.5 hours (alkaline); runs 4.5 hours (lithium); 4,950 candelaLow: 40 lumens; 19m beam; runs 8 hours (alkaline); runs 14 hours (lithium); 1,380 candelaStrobe for signaling or disorientingTEN-TAP Programming: Choice of three user-selectable programs: 1) High/Strobe 2) High Only 3) Low/HighRemote pressure switch features momentary and "constant on" operationIntegrated rail clamp attaches to MIL-STD-1913 rails; easy to attach, secure mountingIncludes remote pressure switch, push-button tail cap switch, remote retaining clips, double-sided tape, zip ties, and M-LOK mountDurable, anodized aluminum construction with impact-resistant tempered glass lensIPX7-rated with standard switch installed; waterproof to 1 meter for 30 minutesIPX4-rated with remote pressure switch installedLimited lifetime warranty