The Edelbrock Progressive Nitrous Controller #71900 offers complete control over your nitrous system in a powerful and compact package. Pulse width modulation regulates the amount of Nitrous being delivered over a specified period of time by the nitrous and fuel solenoids. The digital display is easy to read and very simple to program, thanks to touch switch programming. You have the ability to select and individually program the nitrous parameters that you need in order to optimize traction, control your chassis and ramp up your nitrous system safely. The end result leads to quicker ET’s and lessens the risk of engine and chassis abuse. The compact controller is also great for automotive and motorcycle applications. Installation Note: If your progressive controller’s active display flashes on and off or resets itself during operation causing the vehicle to surge, it may be caused by electromagnetic interference generated by the engine’s ignition system or other vehicle components.