"Ignitor I" allows you to get the performance of an electronic ignition system while retaining your stock distributor. Test results show twice the voltage to spark plugs, which increases horsepower, fuel economy and plug life. System fits entirely inside the distributor. Guaranteed for 30 months. "Ignitor II" utilizes a powerful new microprocessor that controls the dwell period, for the best possible spark over the entire rpm range. The electronic module is a huge step up from your old point-type ignition. It offers you quicker starting, longer plug life and increased horsepower. Best of all, you get all of these advantages at a much lower price than those more expensive "box-type" ignition systems. "Ignitor III" features 5-times more spark energy then points ignition for increased burn time, multiple spark discharge through the entire rpm range for improved combustion, increase spark energy for better horsepower and mileage, adjustable rev limiter straightforward do-it-yourself installation.