Single-fire and dual-fire function built into a single module. All-metal housing provides improved heat dissipation. Ignition advance and timing degree markings are on the metal flange. Sensor housings contain advanced flux concentrators with high-temperature-resistant samarium/cobalt magnets for accurate, reliable ignition triggering. Electronics are fully enclosed to resist vibration, moisture and dirt. Four rotary switches for ignition mode selection, advance rate, and rev limit. Made in the U.S.A.. Not for fuel-injected models.