First, let me say how very happy we've been with the driveway alert, at our old home and now at our new home. At the old place it was useful in ways we had not thought of, such as when dogs and hens were escaping, as well as when cars arrived and left. Still performing flawlessly after about 3 years. Now we have moved, and the driveway is sort of a horseshoe. Thank you for making such a great product!