Yes. The boundary line is tentative and depends on the dog learning to recognize the been to know it is near the boundary line. You can use boundary flags as a visual aid as well, but, you are right. If we were to move something in our house it would change the boundary.

Yes. We did drive with it in our van on the end of our road where we know no one else has one of the systems to see if she was still alive and within range, but we don't want to do that in areas we are unfamiliar with where someone could have the same unit and risk a pet getting buzzed for no reason when a child is playing near it. We were relying on hearing her yipe when she was within and then back out of range. The point of my post was to find out if we could detect when the collar came in and back out of range (when she would be getting buzzed) if she is injured or otherwise unable to yipe since this unit does not have that feature. Since I am limited in my knowledge about how radios work, I thought someone here would be able to tell me if there is a way to detect when the transmitter comes in/out of range of the receiver collar, even if we could only be able to search up to around 90 ft in each direction.