MSD DIGITAL -6 PLUS IGNITION CONTROL -- 135Mj Per Spark Energy, 535 Volts Primary Voltage, 45,000 Volts Secondary Voltage, 20 Degrees Crankshaft Rotation, 12,500 RPM With 14.4 Volts RPM Range, 12 -18 Voltage Required, Negative Ground, 0.7Amp Per 1,000 RPM Current Draw, 3.7 Lbs., 8.5"L X 4.5" W X 2.2" H, Built-In A Combination Of Terrific Power, Digital Accuracy And Great Accessories, Features A Wide Variety Of Features Like Two Step Rev Control, Single Stage Retard, Start Retard, And Diagnostic Led, With MSD's Limited 1-Year Warranty