It’s one of the quirks of the house that I live in is that I cannot easily see the end of the driveway from inside the house. This means it’s hard to tell when someone might have arrived, whether expected or unexpected. The Guardline Wireless Driveway Alarm has been a good solution to that problem, as it gives us a nice, loud, BING when its beam is crossed. It’s not perfect — deer and even neighborhood cats occasionally set it off — but I’m happier with it than I was without it.