Pertronix AC-181 Ignitor Electronic Ignition Module. Delivers twice the voltage to the spark plugs, increasing horsepower, fuel economy, and spark plug life. 2:1 improvement over points in current fall time for increased coil output. Rotating cobalt magnets trigger a Hall Effect integrated circuit -No points to burn, No moving parts to wear out. Epoxy molding makes module impervious to dirt, oil, grease and moisture. Fits entirely inside the distributor -No "black box" to clutter the engine compartment. Stable timing -No need for any adjustments. Use with Pertronix Flame-Thrower coils for optimal performance. Guaranteed for 30 months!