Many kits now aren't push a button at all.

They are armed off of the RPM and TPS (throttle position switch) and a combination of RPM and WOT generally triggers the kits.

As for the reply of blowing an Accord 2.3 liter on a 75 shot fogger, that was kinda high to start with on an Accord. Many kits let you start at 35-55hp jump, always start as low as possible and then move up the shot carefully. A good rule of thumb is never shoot below 3500-4000rpm depending on the motor. A lot of guys also don't squeeze in first gear for a trackion-rev limiter issues.

Window switches allow you to set the activation window on a nitrous kit, example a 4000 and 6500 window switch selection will only let you spray between 4k and 6500rpm.

I'm not sure if many people spray on Accords in this forum, but as I said earlier many of the hardcore nitrous junkies are found on; www.clubsi.com