The Carspeed is a capacitive discharge ignition system. It works by storing up charge in a capacitor (inside the Carspeed itself)of about 475 volts.The high voltage of this capacitor is then dumped into the primary of the coil, which induces the even higher voltage in the secondary (around 45000 volts). which will then give you your spark. Capacitive Discharge System, as opposed to inductive system, are able to supply a full charge, even at high RPM. An added bonus the Capacitive Discharge System, is that at low RPM it can actually produce multiple spark.