Armstrong Air® Ignition Control Board, 2-Stage, For Use With: Universal Variable Speed Furnaces, 25 VAC, 60 Hz, 500 mA, Includes: Ignitor 21D64-2, Spanish Installation Instructions 37-7178A, English Installation Instructions 37-7115C, Harness Application Chart 37-7163C, 5 Pin Wire Harness, 12 Pin Wire Harness and Control Board 50V51-843