Holosun Technologies Multi Laser Device, Red Laser, IR Laser, IR Illuminator, Fully Adjustable, Fits 1913 Picatinny Rail, Black Finish LS321R LS321 is a multi-laser device that integrates red 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.