The McCormick 3125984R2 Flasher Unit is a genuine OEM replacement part designed for 12V electrical systems in International Harvester (IH) and Case IH tractors. This flasher unit ensures proper operation of turn signals and hazard lights, featuring a 4x21W + 0-21W power rating. It is compatible with a wide range of models including the 453, 553, 644, 654, 744, 745, 844, 845, 946, 1046, 1246, 955, 1055, 1255, 1455, 3210, 3220, 3230, 3240, 3250, 4210, 4220, 4230, and 4240 series.