My dog, chihuahua, is so resilent to correction. You can tell him something a million times, spray him, watch him, stare him down, he just doesn't get it. So we put this in the living room where we don't want him on the couches, we used a leash to show him what to do.
We put the collar on, we tested the distance/perimeter with the collar, not on the dog. It beeps first, so that's their warning. We put the collar and a leash on the dog, and let him walk over to the couch, he heard the beep, and we moved him away so that he learns where to go. He didn't get it the first time, but got it everytime after that, now he runs when he hears the beep. One problem though, when we put it in the doorway to our room, if he gets too excited he can actually run right through it and he doesn't get bothered by it at all, no shock no beep. But that's cause he's running, he doesn't usually run into a room. PLus he has associated the beep and shock with the sensor, so when he sees the sensor he avoids the area in its entirety. I only wish I could use it with my cat!! That would be great.