This Nitrous Progressive controller unit was designed to allow the aggressive use of nitrous power and putting it on the ground. A simplified wiring harness and easy to adjust push button LED controls makes this device a breeze to install and use. The start percentage can be adjusted from 1% to 100% in 1% increments. The Nitrous build time can be adjusted from 0.0tenths (instant 100%) to 8.0 seconds in 0.1 tenths of a second increments. It also has 2 modes for automatic cut off or continue the count down. It is activated by your WOT switch or your push button switch that activates your nitrous kit. The high amperage drivers can handle all of today's high amperage solenoids. In fact, this controller is so heavy duty it can control 4 large PRO solenoids used on a V8 FOGGER KIT!!! Overall dimensions are 4”x3”x 1.75”. Shop around and you will find that this is the best deal on the market today! This device is perfect for your nitrous installation and is a must have if you are running shots over 50HP for your engine's safety and longevity. The "hit" of nitrous is what damages components and what has given Nitrous a bad name, but with this heavy duty progressive digital controller you won't have to worry about any of that.