Anyway. In testing them, we figured out that their range extends over every part of our property and a good ways up the street as well. WIN! We're going to go through an ungodly number of batteries this summer, but I now have a way to reach the kids without making myself hoarse and they have a chance to break the bad habit that their parent has modeled so diligently for them over the past three and a half years.
It's the little solutions that make such a big difference in the quality of a day.