For CB250 Hornet CB250 Jade CBR400RR NC29 400cc Motorcycle Ignition Control Unit Color: Black；Shell material: PPC；Material Type：Plastic + wire；Applicable voltage: 12V-14V Easy to install: Stable function, easy to install, will not damage your vehicle, and provide better energy saving and cost-effectiveness. The CDI (Capacitor Discharge Ignition) system for motorcycles is a high-energy ignition system that generates a strong spark to ignite the air-fuel mixture in the engine, thus achieving combustion. Its working principle includes: a capacitor is charged, a sensor signal triggers discharge, and a coil generates a spark to ignite the mixture.