Ping-pong, which requires no construction work, saves a hopeless house that "doesn't know who's coming."

This article has been edited and republished from July 11, 2025. If you don't know about this update, you'll be at a loss. Ping Pong (doorbell) at my parents' house, which is over 40 years old. Of course there was no camera, it was just a simple device that made a "ping-dong" sound when you pressed it, but that simple...