LS321 is a multi-laser device that integrates green laser, IR laser and IR illuminator. It has a mode selector to choose the different functions. The operator uses W&E adjuster to adjust the 3 laser beams at the same time. The IR illuminator-focusing knob is located at the rear of the unit for ease of adjustment for operator.Features: Coaxial visible laser, IR laser, IR illuminator Rear side focusing knob QD mount integrated CNC machined housing Remote cable switch includedSpecifications: Model: 321G Fit: 1913 Picatinny Rail Type: Laser Finish/Color: Black