The 120 mm Mortar Infrared Smoke (IR-SMK) round provides visual and infrared screening for several minutes over a wide area. The round functions by way of a time fuze, in a height from 400 m to 500 m wherein the front and rear body are split, ejecting burning smoke pots containing red phosphorus. Round is delivered as a ready to fire in 2-round containers, equipped with fuze and charge system.