Yes, silly things quoted a 15 mile range or something on them, but in testing them with the kids the other day, I could barely hear them at the park three blocks away, with metal everywhere they would probably be less-than worthless.
OK, well the kids will just be "free range" then. We will have to set-up specific times to check in with them I suppose, or maybe we just won't see them for a week, either way.