Single-channel capacitive discharge ignition designed for high cylinder pressure, high horsepower engines running an MSD Power-Grid.;Adjustable output energy up to 680 millijoules (mJ); Over 3A peak spark current when used with the recommended ignition coil PN 82612/3; Compatible with 8/6/4 cylinder engines; Spark current sense and recording for each firing; Spark duration of greater than 250 microseconds; Rated for continuous operation at an output of 600 mJ; Operates between 12- 28V; Minimum starting voltage 6-volts; Direct plug-in to MSD Power Grid Controller PN7730; Reverse battery protection; Internally protected from damage caused by internal over-temperature or open / shorted coil; Diagnostic LED detects the presence of faults; On-the-fly Power Output selection wire;