Assuming that the 2018 is the same (or better) than the 2014, you don't even have to turn them off everytime. They remember the last setting, so if they're off when you shut off your car, they'll be off when you turn it back on. I do like the auto-power feature so when i'm out with my son and he's watching a DVD or other, next time I start the car the screens come on. But when I'm out by myself they are off and they don't turn on unless I specifically turn them on. If that makes sense.