The ProTac Rail Mount HL-X features a fixed-mount for MIL-STD 1913 or M-LOK compatible rails. Lightweight, this bright light can be used in close quarter combat or to identify medium range threats. Rugged, reliable and features a remote switch with momentary/constant on operation or a standard push-button tail switch.Features1,000 lumensTEN-TAP programming - Choose from three user-selectable programs:1) high/strobe 2) high only 3) low/highIntegrated rail clamp attaches to MIL-STD-1913 (Picatinny) rail or M-LOK compatible railsBATTERYMulti-Fuel: Uses one Streamlight SL-B26 protected Li-Ion USB rechargeable battery packAlso accepts two CR123A lithium batteriesMATERIAL/DURABILITY6000 series machined aircraft aluminum with anodized finishGasket-sealed glass lensIP67-rated with standard push-button switch installed (waterproof to1m for 30 minutes); IP54-rated with remote pressure switch installed(water-resistant)2-meter impact resistance tested